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Littelfuse

lfus · NASDAQ Technology
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Ticker lfus
Exchange NASDAQ
Sector Technology
Industry Hardware, Equipment & Parts
Employees 10,000+
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FY2017 Annual Report · Littelfuse
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CORPORATE INFORMATION

A N N U A L  M E E T I N G
A N N U A L   M E E T I N G

The Annual Meeting of Littelfuse, Inc. will be held at 
9:00 a.m. Central Time on April 27, 2018, at the O’Hare 
Plaza First Floor Conference Center, 8745 West Higgins 
Road, Chicago, IL 60631. Proxy materials and a copy 
of this report will be mailed or made available via the 
Internet in advance of the meeting to all shareholders 
of record as of March 1, 2018.

C O M M O N   S T O C K
C O M M O N  S T O C K

Littelfuse, Inc. common stock is traded on the NASDAQ® 
Global Select Market under the symbol LFUS. 

S H A R E H O L D E R   I N F O R M AT I O N
S H A R E H O L D E R  I N F O R M AT I O N

In addition to annual reports to shareholders, copies of 
the Company’s fi lings with the Securities and Exchange 
Commission are available on the Investor Relations 
section of our website at: investor.littelfuse.com.

I N D E P E N D E N T   R E G I S T E R E D 
I N D E P E N D E N T  R E G I S T E R E D  
P U B L I C   A C C O U N T I N G   F I R M
P U B L I C  A C C O U N T I N G  F I R M

Grant Thornton LLP
171 N. Clark Street
Suite 200 
Chicago, IL 60601

T R A N S F E R   A G E N T
T R A N S F E R  A G E N T

EQ Shareowner Services
110 Centre Pointe Curve, Suite 101
Mendota Heights, MN 55110
1.800.468.9716

L I T T E L F U S E  W O R L D   H E A D Q U A R T E R S
L I T T E L F U S E W O R L D  H E A D Q U A R T E R S

Littelfuse, Inc.
8755 West Higgins Road
Suite 500  
Chicago, IL 60631
+1.773.628.1000

Littelfuse.com

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2017
ANNUAL 
REPORT

littl_2797_1_1_2017AR_Cover_MECH.indd   1

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© 2018 Littelfuse, Inc. | Form: CM105-EN

 
 
 
M I C H A E L  P.   R U T Z
Senior Vice President, 
Global Operations

M AT T H E W  J .   C O L E
Senior Vice President and General 
Manager, Industrial Business Unit 

I A N  H I G H L E Y
Senior Vice President and General 
Manager, Semiconductor Products 
and Chief Technology Offi cer

D E E PA K  N AYA R
Senior Vice President and General 
Manager, Electronics Business Unit

EXECUTIVE OFFICERS

DAV I D W.   H E I N Z M A N N
President and Chief 
Executive Offi cer

M E E N A L  A .   S E T H N A
Executive Vice President 
and Chief Financial Offi cer

R YA N  K .   S TA F F O R D
Executive Vice President, Chief Legal 
and Human Resources Offi cer and 
Corporate Secretary

BOARD OF DIRECTORS

T Z A U - J I N   C H U N G
Operating Partner
Core Industrial Partners LLC

J O H N   E .   M A J O R
President
MTSG

C A R Y  T.   F U
Co-Founder and 
Retired Chairman
Benchmark Electronics, Inc.

A N T H O N Y   G R I L L O
Founder 
Ascribe Opportunities 
Management, LLC

DAV I D  W.   H E I N Z M A N N
President and 
Chief Executive Offi cer
Littelfuse, Inc.

G O R D O N   H U N T E R
Chairman of the Board
Retired President and 
Chief Executive Offi cer
Littelfuse, Inc.

P
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B
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W I L L I A M   P.   N O G L OW S
Chairman of the Board
Cabot Microelectronics 
Corporation

R O N A L D   L .   S C H U B E L
Retired Executive Vice President 
and President of the Americas Region 
Molex Incorporated

D R .   N AT H A N  Z O M M E R
Founder, former Chairman 
and Chief Executive Offi cer 
IXYS Corporation

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS 
UNDER THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995 (“PSLRA”)

The statements contained in the letter to shareholders and the other sections of this report and in the Company’s Annual Report on Form 
10-K that are not historical facts are intended to constitute “forward-looking statements” entitled to the safe-harbor provisions of the PSLRA. 
These statements may involve risks and uncertainties, including, but not limited to, risks relating to product demand and market acceptance, 
economic conditions, the impact of competitive products and pricing, product quality problems or product recalls, capacity and supply 
diffi culties or constraints, coal mining exposures reserves, failure of an indemnifi cation for environmental liability, exchange rate fl uctuations, 
commodity price fl uctuations, the effect of the company’s accounting policies, labor disputes, restructuring costs in excess of expectations, 
pension plan asset returns less than assumed, integration of acquisitions, uncertainties related to political and regulatory changes and other 
risks that may be detailed in “Item 1A, Risk Factors” in the Form 10-K and in the Company’s other Securities and Exchange Commission fi lings.

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3/1/18   3:22 PM

 
 
 
 
DEAR SHAREHO LDERS, 

OUR STRONG PERFORMANCE CO NTINUED IN  2017

In 2017, Littelfuse celebrated 

its 90th anniversary and 

another year of tremendous 

success. Our outstanding 

team of associates around 

the world helped our 

company achieve several 

major accomplishments:

+  We achieved record sales, 

adjusted diluted earnings per 

share and operating cash fl ow. 

+  We increased our investment in 
Monolith Semiconductor and 

launched our fi rst products with 

silicon carbide, a promising 

semiconductor material. 

+  We acquired U.S. Sensor, 
expanding our existing 

sensor platform into 

temperature sensors. 

+  We announced the acquisition 
of IXYS Corporation, the largest 

in our company’s history, which 

we expect to be a catalyst to 

accelerate growth across our 

power control platform.

1  Adjusted diluted EPS excludes acquisition related expenses, 

restructuring, impairment and other charges and gains, as applicable.  
A reconciliation of this non-GAAP fi nancial measure to the most 
directly comparable fi nancial measure calculated and presented 
in accordance with GAAP is set forth on page 6.

2  Calculated as cash from operating activities less capital expenditures. 

Net sales in 2017 were $1.22 billion, 
an increase of 16 percent compared 
to 2016, with 7 percent organic 
growth. The results were led by 
strength in the Electronics and 
Automotive segments. Electronics 
sales increased 24 percent to $662 
million, with strong growth across 
most end markets. Automotive sales 
of $453 million were up 9 percent, 
driven by excellent performance in 
our automotive fuse business and 
our commercial vehicle products 
business. Industrial sales increased 

DAVE HEINZMANN 

President and Chief 
Executive Offi cer

1 percent to $106 million, with key industrial end markets showing 
initial signs of improvement, which more than offset the impact of 
the 2016 sale of our e-house business in Canada.

GAAP diluted EPS was $5.21. Adjusted diluted EPS was $7.741, 
an increase of 24 percent vs. last year. Cash fl ow from operating 
activities was a record $269 million, a 49 percent increase over 
last year. Capital expenditures were $66 million, resulting in 
record free cash fl ow2 of $203 million for the year, a growth of 
52 percent. We continued to return capital to shareholders through 
a 12 percent increase in our cash dividend rate. This was our 
seventh consecutive year of double-digit dividend growth. 

ADVANCING OUR STRATEGY

At the intersection of the global megatrends of safety, energy 
effi ciency and the connected world, our strategy is built upon 
three major areas of expertise that drive our business: protect, 
control and sense. Working with our customers to provide 
safer, more reliable and more effi cient connected products, our 
strategic plan is to continue growing our circuit protection platform; 
accelerate the growth of our power control platform; and double 
the sales of our sensor platform. At our Analyst Day in December 
2016, we launched our updated strategy and outlined our fi ve-year 
roadmap with the following fi nancial targets:

+ Double-digit annual sales growth, with an increased organic 
growth rate of 5–7% and an additional 5–7% growth from 
strategic acquisitions;

+ Double-digit annual growth in earnings per share, led by an 

adjusted operating margin of 17–19%;

+ Free cash fl ow that exceeds net income; and

+ Balanced capital allocation, returning 40 percent of free cash 

fl ow to shareholders through dividends and share repurchases, 
with the remainder focused on strategic acquisitions.

LITTELFUSE.COM | 1

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INN OVATIO N 

—

At the foundation of our 

strategy is our ongoing focus 

on innovation, one of our core 

values. We anticipate customer 

needs and deliver innovative 

solutions that add value and 

grow our business. We take a 

collaborative, partnership-driven 

approach in the design and 

development of new products. 

In 2017, new products accounted 

for 28 percent of our revenue.

2 | LITTELFUSE ANNUAL REPORT 2017

KEY STRATEGIC GROWTH OPPO RTUNITIES

In key market niches across our segments, we have 
identifi ed several strategic growth opportunities that align 
with our strengths and allow us to grow at a faster pace 
than the general market. From the Internet of Things (IoT) 
to industrial and automotive electronics to the increasing 
need for sensors, our targeted areas for growth are centered 
on safety, energy effi ciency and the connected world.

    INTERNET OF THINGS

Trends in connectivity and the IoT are key drivers for 
our continued growth. Increasingly, the things we use 
in our day-to-day lives—and the industrial equipment 
needed to manufacture these things—are connected to 
the Internet. Common household items—from doorbells 
and garage door openers to security systems and home 
appliances—are becoming more and more sophisticated, 
as are the machines, tooling and factories used in 
production. They all require circuit protection, power 
control and sensing technologies while collecting data 
and sending it to the cloud. IoT extends further to the 
vehicles we drive. Today’s connected vehicles feature 
innovative telematics systems that reduce unscheduled 
maintenance and improve reliability. In the future, vehicle-
to-vehicle and vehicle-to-infrastructure connectivity will be 
key enablers in the advancement of autonomous driving 
technologies. Beyond the added content opportunities 
in connected devices and vehicles, we also are seeing 
growth from telecom, datacenters and cloud infrastructure 
needed to store and analyze the massive amounts of 
data these products generate.  

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    INDUSTRIAL ELECTRONICS

    AUTOMOTIVE ELECTRONICS

Another important intersection point that shows solid 
long-term growth potential is the need for advanced 
circuit protection and power control technologies in 
industrial end-markets. With expanding smart grid 
initiatives and the ongoing emphasis on energy 
effi ciency, there are signifi cant content opportunities 
for our electronics products. Smart utility meters, 
outdoor LED lighting, energy storage and electric 
vehicle (EV) charging stations are all examples of 
energy effi ciency and infrastructure projects that 
are creating solid demand for our products across 
a wide range of industrial applications. 

Medium- to high-power industrial motors consume 
a signifi cant percentage of the world’s electricity. 
Achieving even a 5 percent increase in effi ciency for 
these types of applications can drive considerable 
energy savings. To obtain these types of improvements, 
industrial applications like elevators, pumping stations, 
industrial HVAC systems, locomotives and railways as 
well as renewable energy and energy storage will all need 
more power semiconductors and more circuit protection 
technologies. Our acquisition of IXYS fi ts squarely within 
our strategy to accelerate growth in these industrial 
applications through our expanded power control platform. 
The addition of the IXYS portfolio helps grow our offerings 
beyond the existing Littelfuse presence in the lower power 
range, into medium- to high-power semiconductors. 
IXYS has strong customer relationships with industrial 
OEMs, which will help to diversify and expand our 
presence within the industrial electronics markets. 

At the convergence between our electronics products 
and automotive customers, we continue to invest in 
automotive electronics. Global auto manufacturers are 
adding more sophisticated vehicle features to improve 
safety with advanced driver assistance systems that 
include adaptive cruise control, lane departure warnings 
and blind spot monitoring. The increasing focus on driver 
comfort and convenience is driving mainstream adoption 
of infotainment and navigation systems, powered tailgates 
and heated seats and steering wheels to name a few. 
Across all these applications, today’s vehicles require 
increasingly advanced circuit protection, power control 
and sensing technologies, extending opportunities to 
increase our content-per-vehicle. 

In addition to safety and comfort, the need for fuel 
effi ciency and performance improvements is also 
driving the increasing electrifi cation of vehicles and our 
continued content growth. Automakers are introducing 
more complex systems with higher power needs that 
often require multiple batteries or lend themselves to 
the ongoing evolution toward 48-volt systems. Today’s 
most fuel effi cient internal combustion engines rely 
on electrically-driven systems that help reduce loads 
previously driven from the vehicle’s powertrain. 

Innovative vehicle features like ride-leveling, auto 
start-stop systems and regenerative braking technologies 
are all driving major improvements in performance and 
effi ciency—and an increased demand for our products. 

LITTELFUSE.COM | 3

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As hybrids and EVs continue to gain momentum, we 
see additional opportunities in EV battery management 
systems and on-board charging systems as well as 
EV charging infrastructure. By leveraging the strong 
relationships Littelfuse maintains with automotive 
customers, we see meaningful opportunities to 
expand the IXYS power semiconductor portfolio 
further into the automotive space. 

Our electronics sensors help detect position, proximity 
and fl uid level, and are playing an increasingly critical 
role in today’s household appliances and security systems. 
With the acquisition of U.S. Sensor in July 2017, we added 
temperature sensing capabilities, expanding our existing 
sensing portfolio in several applications ranging from 
appliances and home automation to thermostats and 
HVAC systems.  

    SENSORS

Over the past fi ve years, through acquisitions as well 
as organic growth, we have developed a successful 
global sensing platform to target both electronics and 
automotive end users. Similar to the opportunities we see 
in automotive electronics, our automotive sensor business 
is well-positioned to take advantage of the increasing 
focus on the safety, effi ciency and comfort of drivers and 
passengers. We offer a comprehensive portfolio of seat 
belt buckle sensors to ensure occupant safety as well as 
solar sensors that integrate with a vehicle’s automated 
climate control system. Our line of speed and positioning 
sensors are used in automotive applications like powered 
seats and powered tailgates as well as in vehicle 
suspensions, transmissions and braking systems. 

“Our associates around 

the world are doing an 

outstanding job of executing 

on our strategy by leveraging 

our well-established global 

presence, industry-leading 

products, diversifi ed markets 

and strong customer 

relationships.”

4 | LITTELFUSE ANNUAL REPORT 2017

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OPERAT IO NAL E X CELLENC E:  EV E RYON E ,   EV ERY DAY,  EVERYWHERE

Strong execution and operational excellence provide the foundation for our overall strategy and fi nancial success. To help 
drive a continuous improvement mindset through every level of our organization, we continue to implement our comprehensive 
operational roadmap, the Littelfuse Operating System (LFOS). Our Enterprise Lean Six Sigma program is a key operational capability, 
and one where we have made signifi cant progress. In fact, our manufacturing operations in Dongguan and Suzhou, China, were 
recognized by the Association for Manufacturing Excellence (AME) for demonstrated excellence in manufacturing and business. 
This is the second year in a row that Littelfuse China operations have been recognized. Our operations in Wuxi, China, received 
the AME Excellence Award in 2016. 

LEAD E RS HIP /G OVERNANC E  U PDATES

In January 2017, we completed our planned leadership succession, where I took over the role of President and Chief Executive Offi cer 
and joined the Littelfuse Board of Directors. As part of that transition, Gordon Hunter, Littelfuse Chairman of the Board, President and 
Chief Executive Offi cer since 2005, became Executive Chairman of the Board. Effective January 1, 2018, Gordon assumed the role of 
Chairman of the Board.

In January 2018, Dr. Nathan Zommer, Founder, and former Chairman and Chief Executive Offi cer of IXYS, joined the Littelfuse 
Board of Directors. Dr. Zommer brings more than 30 years of leadership in the semiconductor industry and his experience will 
be an asset to our board.

BRIGHT MI ND S .  BIG I MPACT.

Our associates around the world are doing an outstanding job of executing on our strategy by leveraging our well-established 
global presence, industry-leading products, diversifi ed markets and strong customer relationships. Every day, the bright minds of 
our associates make a big impact. I am proud of the more than 11,000 Littelfuse associates around the world as they demonstrate 
their dedication and commitment to deliver for our customers and shareholders—and build momentum for the future. 

DAVE HEINZMANN

PR ES IDEN T A ND CHI EF EXEC UT I V E  OF F I CER 

 LITTELFUSE.COM | 5

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GAAP TO NON-GAAP RECONCILIATION

$ in millions, except per share data

NON-G AAP EPS  R ECONC ILIAT IO N

GAAP diluted EPS

EPS impact of Non-GAAP adjustments (below)

Adjusted diluted EPS

NON-G AAP ADJ US TME NTS –  (I NC O ME ) E XP E NSE

Reed switch manufacturing transfer costs

Restructuring

Acquisition-related and integration costs

Impairment of goodwill and intangible assets

Non-GAAP adjustments to operating income

Non-operating foreign exchange loss

Non-GAAP adjustments to income before income taxes

Income taxes

Non-GAAP adjustments to net income

Total EPS impact

FRE E CA SH  FLOW RE CONC IL IATI O N

Net cash provided by operating activities

Less: Purchases of property, plant and equipment

Free cash flow

2017

$5.21

$2.53

$7.7 4

2017

$ –

$2.2

$8.1

$ –

$10.3

$2.4

$12.7

($45.3)

$58.0

$2.53

2017

$269.2

($65.9)

$203.3

2016

$4.60

$1.66

$6.26

2016

$1.6

$2.5

$31.1

$14.8

$50.0

$0.5

$50.5

$12.6

$37.9

$1.66

2016

$180.1

($46.2)

$133.9

NET  SALES R ECONCI LIAT ION

2017 VS. 2016

Net sales growth

Less:

Acquisitions

Divestitures

FX impact

Organic net sales growth

NON-GAAP FINANCIAL MEASURES

The information included in the letter to shareholders includes the non-GAAP 
financial measures of adjusted diluted earnings per share and organic net 
sales growth. These non-GAAP financial measures exclude the effect of certain 
expenses and income not related directly to the underlying performance of our 
fundamental business operations. The company believes that adjusted diluted 
earnings per share and organic net sales growth provide useful information 
to investors regarding its operational performance because they enhance 
an investor’s overall understanding of our core financial performance and 
facilitate comparisons to historical results of operations, by excluding items 
that are not related directly to the underlying performance of our fundamental 
business operations or historical business operations. A reconciliation of 

6 | LITTELFUSE ANNUAL REPORT 2017

ELECTRONICS

AUTOMOTIVE

INDUSTRIAL

TOTAL

24%

14%

–

–

10%

9%

5%

–

–

4%

1%

–

(7%)

1%

7%

16%

9%

(1%)

1%

7%

these non-GAAP financial measures to the most directly comparable GAAP 
financial measures is included herein. The letter to shareholders also includes 
the non-GAAP measure of free cash flow, which is reconciled in the letter. The 
company believes free cash flow is a useful measure of its ability to generate 
cash. The company believes that these non-GAAP financial measures are 
commonly used by financial analysts and others in the industries in which we 
operate, and thus further provide useful information to investors. Management 
additionally uses these measures when assessing the performance of the 
business and for business planning purposes. Note that our definitions of 
these non-GAAP financial measures may differ from those terms as defined  
or used by other companies.

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(Mark one) 

[X] 

[   ] 

UNITED STATES 
SECURITIES AND EXCHANGE COMMISSION 
Washington, D.C. 20549 

FORM 10-K 

Annual Report Pursuant to Section 13 or 15(d) 
of the Securities Exchange Act of 1934 
for the fiscal year ended December 30, 2017  
Or 
Transition Report Pursuant to Section 13 or 15(d) 
of the Securities Exchange Act of 1934 
for the transition period from to 

Commission file number 0-20388 
LITTELFUSE, INC. 
(Exact name of registrant as specified in its charter) 

Delaware 
(State or other jurisdiction of 
incorporation or organization) 

8755 West Higgins Road, Suite 500 
Chicago, Illinois 
(Address of principal executive offices) 

36-3795742 
(I.R.S. Employer Identification No.) 

60631 
(ZIP Code) 

773-628-1000 
(Registrant’s telephone number, including area code) 

Securities registered pursuant to Section 12(b) of the Act: 

Title of Each Class 
Common Stock, $0.01 par value 

Name of Each Exchange 
On Which Registered 
NASDAQ Global Select MarketSM 

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes [X] No [ ] 
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes [ ] No [X] 
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange 
Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has 
been subject to such filing requirements for the past 90 days. Yes [X] No [ ] 
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, if any, every Interactive 
Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (Section 232.405 of this chapter) during the preceding 
12 months (or for such shorter period that the registrant was required to submit and post such files). Yes [X] No [ ] 
Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be 
contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this 
Form 10-K or any amendment to this Form 10-K. [ ] 
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting 
company, or emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “small reporting company,” 
and “emerging growth company” in Rule 12b-2 of the Exchange Act (Check one):  
Large accelerated filer [X]  Accelerated filer [ ]  Non-accelerated filer [ ]  Smaller reporting company [ ]  Emerging growth company [ ]
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying 
with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. [ ] 
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes [ ] No [X] 
The aggregate market value of 22,647,077 shares of voting stock held by non-affiliates of the registrant was approximately $3,736,767,705 
based on the last reported sale price of the registrant’s Common Stock as reported on the NASDAQ Global Select MarketSM on July 1, 
2017. 
As of February 16, 2018, the registrant had outstanding 24,830,204 shares of Common Stock, net of Treasury Shares. 

Portions of the Littelfuse, Inc. Proxy Statement for the 2017 Annual Meeting of Stockholders (the “Proxy Statement”) are incorporated by 
reference into Part III of this Form 10-K. 

DOCUMENTS INCORPORATED BY REFERENCE 

 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
TABLE OF CONTENTS 

Page 

FORWARD-LOOKING STATEMENTS  ................................................................................................................ 

1 

PART I 
Item 1. 
Business ....................................................................................................................................................... 
Item 1A.  Risk Factors ................................................................................................................................................. 
Item 1B.  Unresolved Staff Comments ........................................................................................................................ 
Item 2. 
Properties ..................................................................................................................................................... 
Legal Proceedings ....................................................................................................................................... 
Item 3. 
Item 4.  Mine Safety Disclosures .............................................................................................................................. 

PART II    
Item 5.  Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity 

Securities ................................................................................................................................................ 
Item 6. 
Selected Financial Data ............................................................................................................................... 
Item 7.  Management’s Discussion and Analysis of Financial Condition and Results of Operations ...................... 
Item 7A.  Quantitative and Qualitative Disclosures About Market Risk ..................................................................... 
Financial Statements and Supplementary Data ........................................................................................... 
Item 8. 
Item 9. 
Changes in and Disagreements with Accountants on Accounting and Financial Disclosure ...................... 
Item 9A.  Controls and Procedures .............................................................................................................................. 
Item 9B.  Other Information ........................................................................................................................................ 

PART III   
Item 10.  Directors, Executive Officers and Corporate Governance .......................................................................... 
Item 11.  Executive Compensation ............................................................................................................................. 
Item 12.  Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters. ... 
Item 13.  Certain Relationships and Related Transactions, and Director Independence ............................................ 
Item 14.  Principal Accounting Fees and Services ...................................................................................................... 

PART IV    
Item 15.  Exhibits, Financial Statement Schedules. .................................................................................................... 
Item 16.  Form 10-K Summary ................................................................................................................................... 
Schedule II – Valuation and Qualifying Accounts and Reserves ........................................................... 
Signatures ............................................................................................................................................... 
Exhibit Index .......................................................................................................................................... 

1 
7 
13 
13 
13 
13 

14 
16 
16 
33 
34 
74 
74 
74 

75 
76 
76 
77 
77 

77 
77 
78 
79 
80 

i 

  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
FORWARD-LOOKING STATEMENTS 

Certain  statements  contained  in  this  Annual  Report  on  Form  10-K  that  are  not  historical  facts  are  intended  to  constitute 
“forward-looking statements” entitled to the safe-harbor provisions of the Private Securities Litigation Reform Act of 1995 
(“PSRLA”). These statements may involve risks and uncertainties, including, but not limited to, risks relating to product 
demand  and  market  acceptance;  economic  conditions;  the  impact  of  competitive  products  and  pricing;  product  quality 
problems or product recalls; capacity and supply difficulties or constraints; coal mining exposures reserves; failure of an 
indemnification  for  environmental  liability;  exchange  rate  fluctuations;  commodity  price  fluctuations;  the  effect  of  the 
company’s accounting policies; labor disputes; restructuring costs in excess of expectations; pension plan asset returns less 
than assumed; uncertainties related to political and regulatory changes; integration of acquisitions including the integration 
of the recently acquired business of IXYS Corporation (“IXYS”) and the risk that expected benefits, synergies and growth 
prospects of the acquisition of IXYS may not be achieved in a timely manner, or at all; and other risks that may be detailed 
in “Item 1A. Risk Factors” below and in the company’s other Securities and Exchange Commission filings. 

AVAILABLE INFORMATION  

The Company is subject to the reporting and information requirements of the Securities Exchange Act of 1934, as amended 
and as a result, are obligated to file annual, quarterly, and current reports, proxy statements, and other information with the 
United States Securities and Exchange Commission (“SEC”). The Company makes these filings available free of charge on 
its website (http://www.littelfuse.com) as soon as reasonably practicable after it electronically files them with, or furnish 
them to, the SEC. Information on the Company’s website does not constitute part of this Annual Report on Form 10-K. In 
addition,  the  SEC  maintains  a  website  (http://www.sec.gov)  that  contains  the  Company’s  annual,  quarterly,  and  current 
reports, proxy and information statements, and other information the Company electronically files with, or furnishes to, the 
SEC. Any materials the Company files with, or furnish to, the  SEC may also be read and/or copied at the SEC’s Public 
Reference Room at 100 F Street, N.E., Washington D.C. 20549. Information on the operation of the Public Reference Room 
may  be  obtained  by  calling  the  SEC  at  1-800-SEC-0330.  the  Company’s  website  address  is  included  in  this  report  for 
informational purposes only. The Company’s website and the information contained therein or connected thereto are not 
incorporated into this Annual Report on Form 10-K. 

PART I 

ITEM 1. BUSINESS. 

GENERAL 

Littelfuse, Inc., was incorporated under the laws of the State of Delaware in 1991. References herein to the “Company,” 
“we,” “our” or “Littelfuse” refer to Littelfuse, Inc. and its subsidiaries. References herein to “2017”, “fiscal 2017” or “fiscal 
year 2017” refer to the fiscal year ended December 30, 2017. References herein to “2016”, “fiscal 2016” or “fiscal year 2016” 
refer to the fiscal year ended December 31, 2016. References herein to “2015”, “fiscal 2015” or “fiscal year 2015” refer to 
the fiscal year ended January 2, 2016. The Company operates on a 52-53 week fiscal year (4-4-5 basis) ending on the Saturday 
closest to December 31. Therefore, the financial results of certain fiscal years and the associated 14 week quarters will not 
be exactly comparable to the prior and subsequent 52 week fiscal years and the associated quarters having only 13 weeks. As 
a result of using this convention, each of fiscal 2017 and fiscal 2016 contained 52 weeks, whereas fiscal 2015 contained 53 
weeks. 

OVERVIEW 

Founded in 1927, Littelfuse is a global leader in circuit protection products with advancing platforms in power control and 
sensor technologies, serving customers in the electronics, automotive, and industrial markets. With a diverse and extensive 
product portfolio of fuses, semiconductors, polymers, ceramics, relays and sensors, the Company works with its customers 
to build safer, more reliable and more efficient products for the connected world in virtually every market that uses electrical 
energy, ranging across consumer electronics, IT and telecommunication applications, industrial electronics, automobiles and 
other transportation, and heavy industrial applications 

The company maintains a network of global laboratories and engineering centers that develop new products and product 
enhancements, provide customer application support and test products for safety, reliability, and regulatory compliance.  

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Segments 

The Company conducts its business through three reportable segments: Electronics, Automotive, and Industrial. For each of 
these segments, the Company designs, manufactures and sells circuit protection products that protect against electrostatic 
discharge, power surges, short circuits, voltage spikes and other harmful occurrences; power control products that safely and 
efficiently control power to mitigate equipment damage, minimize electrical hazards and improve productivity; and sensor 
products used to identify and detect temperature, proximity, flow speed and fluid level in various applications. For segment 
and geographical information and consolidated net sales and operating income see Item 7, Management’s Discussion and 
Analysis of Financial Condition and Results of Operations and Note 12, Segment Information, of the Notes to Consolidated 
Financial Statements included in this Annual Report. 

●  Electronics  Segment:  Consists  of  one  of  the  broadest  product  offerings  in  the  industry,  including  fuses  and  fuse
accessories,  positive  temperature  coefficient  (“PTC”)  resettable  fuses,  polymer  electrostatic  discharge  (“ESD”)
suppressors,  varistors,  gas  discharge  tubes;  semiconductor  and  power  semiconductor  products  such  as  discrete
transient voltage suppressor (“TVS”) diodes, TVS diode arrays, protection and switching thyristors, silicon carbide,
metal-oxide-semiconductor  field-effect  transistors  (“MOSFETs”)  and  silicon  carbide  diodes;  and  insulated  gate 
bipolar transistors (“IGBT”) technologies. The segment covers a broad range of end markets, including consumer
electronics, automotive electronics, IT and telecommunications equipment, medical devices, lighting products, and
white goods.  

●  Automotive  Segment:  Consists  of  a  wide  range  of  circuit  protection,  power  control  and  sensing  technologies  for
global  original  equipment  manufacturers  (“OEMs”),  Tier-I  suppliers  and  parts  distributors  in  the  automotive,
commercial  vehicle,  and  agricultural  and  construction  equipment  industries.  Passenger  car  fuse products  include
fuses and fuse accessories, including blade fuses, battery cable protectors, varistors, high-current fuses, and high-
voltage  fuses  for  hybrid  and  electric  vehicles.  Commercial  vehicle  products  include  fuses,  switches,  relays,  and
power distribution modules for the commercial vehicle industry. Automotive sensor products include a wide range
of  automotive  and  commercial  vehicle  products  designed  to  monitor  the  passenger  compartment  occupants  and 
environment as well as the vehicle’s powertrain, emissions, speed and suspension.  

● 

Industrial Segment: Consists of power fuses, protection relays and controls and other circuit protection products for
use  in  heavy  industrial  applications  such  as  mining,  oil  and  gas,  energy  storage,  construction,  HVAC  systems,
elevator and other industrial equipment. 

Strategy 

In December 2016, the Company announced its updated strategic plan. Building upon its achievements from its previous 
five-year plan and leveraging the global mega trends of safety, energy efficiency and the connected world, the Company is 
targeting accelerated annual organic growth of 5-7 percent and annual growth from strategic acquisitions of 5-7 percent. The 
Company’s strategic goals include the continuing growth of its circuit protection platform, accelerating growth in its power 
control platform and doubling its sensor platform over the next four years. The Company expects to do this through content 
and  share  gains,  targeting  underpenetrated  geographies  and  markets,  leveraging  innovation  and  capitalizing  on  growth 
opportunities  where  technologies  and  applications  are  converging  across  its  segments,  while  continuing  to  acquire  and 
integrate businesses that fit its strategic focus areas.  

Recent Acquisitions  

● 

IXYS Corporation: On January 17, 2018, the Company acquired IXYS Corporation “IXYS”, a global pioneer in the
power  semiconductor  and  integrated  circuit  markets  with  a  focus  on  medium  to  high  voltage  power  control
semiconductors across the industrial, communications, consumer and medical markets. IXYS has a broad customer
base, serving more than 3,500 customers through its direct sales force and global distribution partners. The purchase
price for IXYS was approximately $856.5 million, which included consideration of cash, Littelfuse common stock,
and the value of converted, or cash settled IXYS equity awards. For the twelve months ended December 30, 2017,
IXYS  generated  net  sales  of  approximately  $340  million.  IXYS’  operations  will  be  included  in  the  Electronics 
segment.  

●  U.S. Sensor: On July 7, 2017, the Company acquired the assets of U.S. Sensor Corporation (“U.S. Sensor”) for $24.3
million. U.S. Sensor manufactures a variety of high quality negative temperature coefficient thermistors probes and
assemblies. The acquisition expands the Company’s existing sensor portfolio in several key electronics and industrial
end markets. The operations of U.S. Sensor are included in the Electronics segment. 

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●  Monolith  Semiconductor  Inc.:  On  February  28,  2017,  pursuant  to  a  Securities  Purchase  Agreement  between  the
Company and the stockholders of Monolith Semiconductor Inc. (“Monolith”), a U.S. start-up Company developing 
silicon carbide technology, the Company increased its investment in Monolith by acquiring approximately 62% of 
the  outstanding  common  stock  of  Monolith  for  $15.0  million.  The  agreement  includes  provisions  whereby  the
Company will acquire the remaining outstanding stock of Monolith at a time or times based on Monolith meeting
certain technical and sales targets. The operations of Monolith are included in the Electronics segment. 

●  ON Portfolio: On August 29, 2016, the Company acquired certain assets of select businesses (the “ON Portfolio”)
of ON Semiconductor Corporation for $104.0 million. The acquired business, which is included in the Electronics
segment,  consists  of  a  product  portfolio  that  includes  transient  voltage  suppression  (“TVS”)  diodes,  switching
thyristors,  and  IGBTs  for  automotive  ignition  applications.  The  acquisition  expands  the  Company’s  offerings  in 
power semiconductor applications as well as increases its presence in the automotive electronics market. The ON
Portfolio products have strong synergies with the Company’s existing circuit protection business, will strengthen its
channel partnerships and customer engagement, and expand its power semiconductor portfolio.  

●  Menber’s:  On  April  4,  2016,  the  Company  completed  the  acquisition  of  Menber’s  S.p.A.  (“Menber’s”)
headquartered in Legnago, Italy for $19.2 million (net of cash acquired and after settlement of a working capital
adjustment).  The  acquired  business  is  part  of  the  Company's  commercial  vehicle  product  business  within  the
Automotive segment and specializes in the design, manufacturing, and selling of manual and electrical high current 
switches and trailer connectors for commercial vehicles. The transaction expands the Company’s commercial vehicle
products business globally.  

●  PolySwitch: On March 25, 2016, the Company acquired 100% of the circuit protection business (“PolySwitch”) of
TE  Connectivity  Ltd.  for  $348.3  million  (net  of  cash  acquired  and  after  settlement  of  certain  post-closing 
adjustments).  The  PolySwitch  business,  which  is  split  between  the  Automotive  and  Electronics  segments,  has  a
leading  position  in  polymer  based  resettable  circuit  protection  devices,  with  a  strong  global  presence  in  the
automotive,  battery,  industrial,  communications  and  mobile  computing  markets.  PolySwitch  has  manufacturing
facilities in Shanghai and Kunshan, China, and Tsukuba, Japan. The acquisition allows the Company to strengthen
its  global  circuit  protection  product  portfolio,  as  well  as  expands  its  presence  in  the  automotive  electronics  and 
battery end markets. The acquisition also significantly increases the Company’s presence in Japan. 

●  Sigmar: On October 1, 2015, the Company acquired 100% of Sigmar S.r.l. (“Sigmar”) for $6.5 million (net of cash
acquired and including estimated additional net payments of up to $0.9 million, a portion of which was subject to
the achievement of certain milestones). Located in Ozegna, Italy, Sigmar is a leading global manufacturer of water-
in-fuel sensors and also manufactures selective catalytic reduction (“SCR”) quality sensors and diesel fuel heaters
for automotive and commercial vehicle applications. The acquisition further expanded the Company’s automotive
sensor product line offerings within its Automotive segment. 

Sales and Operations 

The Company operates in three geographic regions: the Americas, Europe, and Asia-Pacific. The Company manufactures 
products and sells to customers in all three regions.  

Net sales by segment for the periods indicated are as follows: 

(in thousands) 
Electronics ..........................................................................................   $ 
Automotive .........................................................................................     
Industrial ............................................................................................     
Total ............................................................................................   $ 

2017 
661,928    $ 
453,227      
106,379      
1,221,534    $ 

Fiscal Year 
2016 

535,191    $ 
415,200      
105,768      
1,056,159    $ 

2015 
405,497   
339,957   
122,410   
867,864   

Net sales in the Company’s three geographic regions, based upon the shipped-to destination, are as follows:  

(in thousands) 
Americas ............................................................................................   $ 
Europe ................................................................................................     
Asia-Pacific ........................................................................................     
Total ............................................................................................   $ 

2017      
436,559    $ 
243,858      
541,117      
1,221,534    $ 

2016      
411,105    $ 
200,277      
444,777      
1,056,159    $ 

2015    
401,173   
152,661   
314,030   
867,864   

Fiscal Year 

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The Company’s products are sold worldwide through distributors, a direct sales force and manufacturers’ representatives in 
certain regions. For the fiscal year 2017, approximately 69% of the Company’s net sales were to customers outside the United 
States (“U.S.”), including approximately 26% to China. 

The Company manufactures many of its products on fully integrated manufacturing and assembly equipment. The Company 
maintains product quality through a Global Quality Management System with most manufacturing sites certified under ISO 
9001:2000. In addition, several of the Littelfuse manufacturing sites are also certified under TS 16949 and ISO 14001. 

Additional information regarding the Company’s sales by geographic area and long-lived assets in different geographic areas 
is in Note 12, Segment Information, of the Notes to Consolidated Financial Statements included in this Annual Report. 

BUSINESS ENVIRONMENT 

Electronics Segment 

The Company designs, develops and manufactures a wide range of components and modules that provide circuit protection, 
power control and sensing for a multitude of electronic and industrial electronics applications. Circuit protection technologies 
in  the Electronics  Segment  are  designed  to protect  against  harmful occurrences  like voltage  spikes,  short  circuits, power 
surges and electrostatic discharge. Products include a vast array of fuses and other circuit protection technologies used in a 
variety of electronic products including consumer electronics, automotive electronics, IT and telecommunications equipment, 
medical devices, lighting products, and white goods.  

The  Company  also  offers  a  wide  range  of  power  control  products  used  to  convert  and  regulate  energy  and  safely  and 
efficiently control power across a broad spectrum of applications including industrial and automotive power systems, motor 
drives  and  power  conversion  applications.  Products  include  a  comprehensive  portfolio  of  semiconductor  components 
including  thyristors,  rectifiers  and  fast  recovery  diodes,  IGBTs  and  wide  band  gap  devices.  The  acquisition  of  IXYS  is 
expected  to  accelerate  the  Company’s  growth  across  the  power  control  market  driven  by  IXYS’s  extensive  power 
semiconductor portfolio in medium and high power applications and technology expertise. With IXYS, the Company will be 
able to diversify and expand its presence within industrial electronics markets, leveraging the strong IXYS industrial OEM 
customer  base.  The  Company  also  expects  to  increase  long-term  penetration  of  its  power  semiconductor  portfolio  in 
automotive markets, expanding its global content per vehicle.  

Another  strategic  area  of  focus  in  the  Electronics  Segment  is  the  Company’s  continued  investment  in  silicon  carbide,  a 
promising semiconductor material that enables more efficient power conversion than traditional silicon-based devices. The 
Company increased its investment in Monolith during 2017 and introduced its first silicon carbide products to the market.  

As  products  become  increasingly  sophisticated,  smarter  and  more  connected,  the  need  for  complex  sensor  technologies 
continues  to  grow.  Sensors  products  in  the  Electronics  Segment  are  used  in  a  wide  variety  of  applications  including 
appliances, security systems, medical equipment, and consumer and industrial controls. With the acquisition of U.S. Sensor, 
the Company has added temperature sensors to its existing portfolio. 

Automotive Segment 

The Company is a primary supplier of fuses and circuit protection technologies to global automotive OEMs, through sales 
made to Tier One automotive suppliers, main-fuse box, and wire harness manufacturers that incorporate the fuses into their 
products, as well as automotive component parts manufacturers, and automotive parts distributors. The Company also sells 
its fuses in the replacement parts market, with its products being sold through merchandisers, discount stores, and service 
stations, as well as under private label by national firms.  

Circuit protection needs in the automotive space are expected to generate additional content-per-vehicle with the increased 
electrification of vehicles, as well as the continued development and market penetration of hybrid and electric vehicles. 

Over the past several years, the Company has expanded the Automotive segment into the commercial vehicle market with 
various acquisitions, also expanding the Company’s portfolio of power control products. Additional products in this market 
include:    power  distribution  modules,  low  and  high  current  switches,  solenoids  and  relays,  electronic  switches,  battery 
management products, ignition key switches, and trailer connectors. Custom and market products are sold directly to a mix 
of OEMs, Tier One suppliers, aftermarket channels, as well as through general distribution.  

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The Company continues to expand its automotive sensor business and products and expects this market to provide meaningful 
growth opportunities over the long-term. Products sold into the market include a wide range of automotive and commercial 
vehicle  sensors  designed  to  monitor  the  passenger  compartment  occupants  and  environment  as  well  as  the  vehicle’s 
powertrain, emissions, speed and suspension. A majority of the Company’s automotive sensor sales are made to Tier One 
suppliers.  

Industrial Segment 

The  Company  manufactures  and  sells  a  broad  range  of  low-voltage  and  medium-voltage  circuit  protection  products  to 
electrical distributors and their customers in the construction, OEM and industrial maintenance, repair and operating supplies 
(“MRO”) markets. The Company also designs and manufactures protection relays for the global mining, oil and gas, and 
general industrial markets as well as portable custom electrical equipment for the mining industry in Canada. The Company 
sees growth opportunity by expanding both the geographic markets and distributors it serves as well as continuing to invest 
in new product development.  

Power fuses are used to protect circuits in various types of industrial equipment and in industrial and commercial buildings. 
Protection  relays  are  used  to  protect  personnel  and  equipment  in  harsh  environments  such  as  mining,  oil  and  gas,  and 
industrial  environments  from  excessive  currents,  over  voltages,  and  electrical  shock  hazards  called  ground  faults.  Major 
applications for protection relays include protection of motor, transformer, and power-line distribution circuits. Ground-fault 
relays  are  used  to protect  personnel  and  equipment  in wet  environments  such  as underground  mining  or water  treatment 
applications where there is a greater risk for electricity to come in contact with water and create a shock hazard.  

Littelfuse custom-engineered electrical equipment is designed and built for use in harsh or demanding environments such as 
mines, where standard industrial electrical gear will not meet customer needs for reliability and durability.  

PRODUCT DESIGN AND DEVELOPMENT 

The Company employs scientific, engineering, and other personnel to continually improve its existing product lines and to 
develop new products at its research, product design, and development (“R&D”) and engineering facilities in Champaign and 
Mt. Prospect, Illinois; Fremont, California; Rapid City, South Dakota; Canada; mainland China; Japan; Italy; the Philippines; 
Taiwan, China; Lithuania; Germany; and Mexico. The Company maintains a staff of engineers, chemists, material scientists 
and technicians whose primary responsibility is to design and develop new products. 

Proposals for the development of new products are initiated primarily by sales, marketing, and product management personnel 
with input from customers. The entire product development process usually ranges from a few months to 24 months based 
on the complexity of development, with continuous efforts to reduce the development cycle. During fiscal years 2017, 2016, 
and 2015, the Company expended $50.5 million, $42.2 million, and $30.8 million, respectively, on R&D. 

PATENTS, TRADEMARKS, AND OTHER INTELLECTUAL PROPERTY 

The  Company  generally  relies  on  patents,  trademarks,  licenses,  and  nondisclosure  agreements  to  protect  its  intellectual 
property and proprietary products. In cases where it is deemed necessary by management, key employees are required to sign 
an agreement that they will maintain the confidentiality of the Company’s proprietary information and trade secrets. 

The Company owns a large portfolio of patents worldwide and new products are continually being developed to replace older 
products. The Company regularly applies for patent protection on such new products. While, in the aggregate, the Company’s 
patents are important in the operation of its businesses, the Company believes that the loss by expiration or otherwise of any 
one patent or group of patents would not materially affect its business. 

MANUFACTURING 

The Company performs the majority of its own fabrication, stamps some of the metal components used in its fuses, holders 
and switches from raw metal stock and makes its own contacts and springs. In addition, the Company fabricates silicon wafers 
for certain applications and performs its own plating (silver, nickel, zinc, tin, and oxides). Thermoplastic molded component 
requirements are met through the Company’s in-house molding capabilities. After components are stamped, molded, plated, 
and readied for assembly, final assembly is accomplished on fully automatic and semi-automatic assembly machines. Quality 
assurance  and  operations  personnel,  using  techniques  such  as  statistical  process  control,  perform  tests,  checks  and 
measurements during the production process to maintain the highest levels of product quality and customer satisfaction. 

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The  principal  raw  materials  for  the  Company’s  products  include  copper  and  copper  alloys,  heat-resistant  plastics,  zinc, 
melamine, glass, silver, gold, raw silicon, solder, and various gases. The Company uses a single source for several heat-
resistant plastics and for zinc, but believes that suitable alternative heat-resistant plastics and zinc are available from other 
sources at comparable prices. All other raw materials are purchased from a number of readily available outside sources. 

MARKETING 

The Company’s sales and marketing staff maintains relationships with major OEMs and global distributors. The Company’s 
sales, marketing and engineering personnel also interact directly with OEM engineers to ensure appropriate sensor design, 
circuit protection and reliability within the OEM’s parameters. The Company also markets its products indirectly through a 
worldwide  organization  of  over  60  manufacturers’  representatives  and  distributes  through  an  extensive  network  of 
electronics, automotive and electrical distributors.  

Electronics Segment 

The majority of the Electronics segment’s products are sold through distribution, including global distributors such as Arrow 
Electronics, Inc., Future Electronics and TTI, Inc, with most of the remainder sold directly to OEMs. In the Americas, the 
Company maintains a direct sales staff and utilizes manufacturers’ representatives to sell its electronics products in the U.S. 
and  to  call  on  major  U.S.  and  international  OEMs  and  distributors.  In  Canada,  the  Company  utilizes  manufacturers’ 
representatives and distributors. In Europe and Asia-Pacific regions, the Company also maintains a  direct sales staff and 
utilizes distributors.  

Automotive Segment 

The  Company  maintains  a  direct  sales  force  to  service  all  the  major  automotive  and  commercial  vehicle  OEMs,  system 
suppliers, and Tier One suppliers in the U.S. The Company also has manufacturers’ representatives that sell the Company’s 
products to aftermarket fuse retailers and commercial vehicle product OEMs.  

In Europe, the Company uses both a direct sales force and manufacturers’ representatives to service its OEMs, major system 
suppliers and aftermarket distribution customers. In the Asia-Pacific region, the Company uses both a direct sales force and 
distributors to supply to major OEM system suppliers and Tier One suppliers. 

Industrial Segment 

The Company markets and sells its power fuses and protection relays through manufacturers’ representatives across North 
America. These representatives sell power fuse products through an electrical and industrial distribution network comprised 
of  over  2,500  distributor  buying  locations.  These  distributors  have  customers  that  include  electrical  contractors, 
municipalities, utilities and factories (including both MRO and OEM). 

The  Company’s  field  sales  force  (including  regional  sales  managers  and  application  engineers)  and  manufacturers’ 
representatives call on both distributors and end-users (consulting engineers, municipalities, utilities, and OEMs) in an effort 
to educate these customers on the capabilities and characteristics of the Company’s products. 

CUSTOMERS 

The Company sells to over 6,700 customers and distributors worldwide. Sales to Arrow Electronics, Inc., which were reported 
in our Electronics, Automotive and Industrial segments were 10.6% of consolidated net sales in 2017 but less than 10% in 
2016 and 2015. No other single customer accounted for more than 10% of net sales during any of the last three years. During 
fiscal  2017,  2016,  and  2015,  net  sales  to  customers  outside  the  U.S.  accounted  for  approximately  69%,  66%,  and  60%, 
respectively, of the Company’s total net sales. 

COMPETITION  

The  Company’s  products  compete  with  similar  products  of  other  manufacturers,  some  of  which  may  have  substantially 
greater  financial  resources  than  the  Company.  In  the  electronics  market,  the  Company’s  competitors  include  Eaton 
Corporation,  Bel  Fuse  Inc.,  Bourns  Inc.,  EPCOS,  ON  Semiconductor  Corporation,  STMicroelectronics  NV,  Semtech 
Corporation,  and  Vishay  Intertechnology  Inc.  In  the  automotive  market,  the  Company’s  competitors  include  Eaton 
Corporation, Pacific Engineering, MTA, CTS Corporation, Amphenol Corporation, Sensata Technologies Holding NV, and  

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TE Connectivity Ltd. In the industrial market, the Company’s major competitors include Eaton Corporation, GE Multilin, 
and Mersen. The Company believes that it competes on the basis of innovative products, the breadth of its product line, the 
quality and design of its products, and the responsiveness of its customer service, in addition to price. 

BACKLOG  

The  backlog  of  unfilled  orders  at  December  30,  2017  was  approximately  $243.7  million,  compared  to  $110.3  million  at 
December 31, 2016 with the increase primarily driven by the Electronics segment. Substantially all of the orders currently in 
backlog are scheduled for delivery in 2018. 

EMPLOYEES  

As of December 30, 2017, the Company employed approximately 10,700 employees worldwide. Approximately 20% of the 
Company's total workforce was employed under collective bargaining agreements at December 30, 2017. In Mexico, the 
Company has two separate collective bargaining agreements, one for 1,500 employees in Piedras Negras, expiring January 
31, 2020 and the second for 650 employees in Matamoros, expiring January 1, 2020. Overall, the Company has historically 
maintained satisfactory employee relations and considers employee relations to be good.  

ENVIRONMENTAL REGULATION 

The Company is subject to numerous foreign, federal, state, and local regulations relating to air and water quality, the disposal 
of hazardous waste materials, safety and health. Compliance with applicable environmental regulations has not significantly 
changed the Company’s competitive position, capital spending or earnings in the past and the Company does not presently 
anticipate that compliance with such regulations will change its competitive position, capital spending or earnings for the 
foreseeable future.  

The Company employs a chemical engineer to monitor regulatory matters and believes that it is currently in compliance in 
all material respects with applicable environmental laws and regulations.  

Littelfuse GmbH, which was acquired by the Company in May 2004, is responsible for maintaining closed coal mines from 
legacy operations. The Company is compliant with German regulations pertaining to the maintenance of the mines and has 
an accrual related to certain of these coal mine shafts based on an engineering study estimating the cost of remediating the 
dangers (such as a shaft collapse) of certain of these closed coal mine shafts in Germany. The accrual is reviewed annually 
and calculated based upon the cost of remediating the shafts. Further information regarding the coal mine liability accrual is 
provided  in  Note  1,  Summary  of  Significant  Accounting  Policies  and  Other  Information,  of  the  Notes  to  Consolidated 
Financial Statements included in this Annual Report. 

ITEM 1A. RISK FACTORS. 

The  Company’s  business,  financial  condition,  and  results  of  operations  are  subject  to  various  risks  and  uncertainties, 
including the risk factors it has identified below. Any of the following risk factors could materially and adversely affect the 
Company’s  business,  financial  condition,  or  results  of  operations.  These  factors  are  not  necessarily  listed  in  order  of 
importance. 

The Company’s industry is subject to intense competitive pressures. 

The Company operates in markets that are highly competitive. The Company competes on the basis of price, quality, service, 
and / or brand name across the industries and markets it serves. Competitive pressures could affect the prices the Company 
is able to charge its customers or the demand for its products. 

The Company may not always be able to compete on price, particularly when compared to manufacturers with lower cost 
structures. Some of the Company’s competitors have substantially greater sales, financial and manufacturing resources and 
may  have  greater  access  to  capital  than  the  Company.  As  other  companies  enter  its  markets  or  develop  new  products, 
competition  may  further  intensify.  The  Company’s  failure  to  compete  effectively  could  materially  adversely  affect  its 
business, financial condition, and results of operations. 

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The Company engages in strategic acquisitions and may not realize the anticipated benefits of the acquisitions and / or 
may encounter difficulties in integrating these businesses. 

The Company seeks to grow through strategic acquisitions. In the past, the Company has acquired a number of businesses or 
companies and additional product lines and assets. The Company intends to continue to expand and diversify its operations 
with additional future acquisitions.  

An acquired business, technology, service or product could under-perform relative to the Company’s expectations and the 
price paid for it, or not perform in accordance with the Company’s anticipated timetable.  This could cause the Company’s 
financial results to differ from expectations in any given fiscal period, or over the long term.  The success of these transactions 
also depends on the Company’s ability to integrate the assets, operations, and personnel associated with these acquisitions. 
The Company may encounter difficulties in integrating acquisitions with the Company’s operations and may not realize the 
degree or timing of the benefits that are anticipated from an acquisition. 

The Company may also discover liabilities or deficiencies associated with the companies or assets it acquires that were not 
identified in advance, which may result in significant unanticipated costs. The effectiveness of the Company’s due diligence 
review and its ability to evaluate the results of such due diligence are dependent upon the accuracy and completeness of 
statements and disclosures made or actions taken by the companies acquired or their representatives, as well as the limited 
amount of time in which acquisitions are executed. In addition, the Company may fail to accurately forecast the financial 
impact  of  an  acquisition  transaction,  including  tax  and  accounting  charges.  Acquisitions  may  also  result  in  recording  of 
significant additional expenses to the results of operations and recording of substantial intangible assets on the balance sheet 
upon closing. Any of these factors may adversely affect the Company’s financial condition or results of operations. 

Reorganization activities may lead to additional costs and material adverse effects. 

In the past, the Company has taken actions to restructure and optimize its production and manufacturing capabilities and 
efficiencies through relocations, consolidations, plant closings or asset sales. In the future, the Company may take additional 
restructuring  actions  including  the  consolidating,  closing  or  selling  of  additional  facilities.  These  actions  could  result  in 
impairment charges and various charges for such items as idle capacity, disposition costs and severance costs, in addition to 
normal  or  attendant  risks  and  uncertainties.  The  Company  may  be  unsuccessful  in  any  of  its  current  or  future  efforts  to 
restructure  or  consolidate  its  business.  Plans  to  minimize  or  eliminate  any  loss  of  revenues  during  restructuring  or 
consolidation  may  not  be  achieved.  These  activities  may  have  a  material  adverse  effect  upon  the  Company’s  business, 
financial condition or results of operations. 

The Company may be unable to manufacture and deliver products in a manner that is responsive to its customers’ needs. 

The end markets for the Company’s products are characterized by technological change, frequent new product introductions 
and  enhancements,  changes  in  customer  requirements  and  emerging  industry  standards.  The  introduction  of  products 
embodying new technologies and the emergence of new industry standards could render its existing products obsolete and 
unmarketable  before  it  can  recover  any  or  all  of  its  research,  development,  and  commercialization  expenses  on  capital 
investments. Furthermore, the life cycles of its products may change and are difficult to estimate. 

The Company’s future success will depend upon its ability to manufacture and deliver products in a manner that is responsive 
to its customers’ needs. The Company will need to develop  and introduce new products and product enhancements on a 
timely  basis  that  keep  pace  with  technological  developments  and  emerging  industry  standards  and  address  increasingly 
sophisticated requirements of its customers. The Company invests heavily in research and development without knowing that 
it will recover these costs. The Company’s competitors may develop products or technologies that will render its products 
non-competitive or obsolete. If it cannot develop and market new products or product enhancements in a timely and cost-
effective manner, its business, financial condition, and results of operations could be materially adversely affected. 

The Company’s ability to manage currency or commodity price fluctuations or supply shortages is limited. 

As a resource-intensive manufacturing operation, the Company is exposed to a variety of market and asset risks, including 
the effects of changes in commodity prices, foreign currency exchange rates, and interest rates. The Company has multiple 
sources of supply for the majority of its commodity requirements. However, significant shortages that disrupt the supply of 
raw materials or result in price increases could affect prices the Company charges its customers, its product costs, and the 
competitive position of its products and services. The Company monitors and manages these exposures as an integral part of 
its overall risk management program, which recognizes the unpredictability of markets and seeks to reduce the potentially 
adverse effects on its results. Nevertheless, changes in currency exchange rates, commodity prices and interest rates cannot 
8 

  
  
  
  
  
  
  
   
  
  
always be predicted. In addition, because of intense price competition and the Company’s high level of fixed costs, it may 
not be able to address such changes even if they are foreseeable. Substantial changes in these rates and prices could have a 
material adverse effect on the Company’s results of operations and financial condition. In addition, significant portions of its 
revenues and earnings are exposed to changes in foreign currency rates. As it operates in multiple foreign currencies, changes 
in  those  currencies  relative  to  the  U.S.  dollar  will  impact  its  revenues  and  expenses.  The  impact  of  possible  currency 
devaluation in countries experiencing high inflation rates or significant exchange fluctuations can impact the Company’s 
results and financial guidance. For additional discussion of interest rate, currency or commodity price risk, see Item 7A, 
Quantitative and Qualitative Disclosures about Market Risks. 

The Company’s effective tax rate could materially increase as a consequence of various factors, including interpretations 
and administrative guidance in regard to the Tax Act (defined below), U.S. and/or international tax legislation, mix of the 
Company’s earnings by jurisdiction, and U.S. and foreign jurisdictional tax audits.  

On December 22, 2017, the U.S. enacted legislation commonly referred to as the Tax Cuts and Jobs Act (the "Tax Act"). 
Among other things, the Tax Act reduces the U.S. corporate federal income tax rate from 35% to 21%, adds base broadening 
provisions  which  limit  deductions  and  address  tax  efficient  international  structures,  imposes  a  one-time  tax  (the  “Toll 
Charge”)  on  accumulated  earnings  of  certain  non-U.S.  subsidiaries  and  enables  repatriation  of  earnings  of  non-U.S. 
subsidiaries free of U.S. federal income tax. Other than the Toll Charge (which is applicable to the Company for 2017), the 
provisions will generally be applicable to the Company in 2018 and beyond. In accordance with the guidance provided in 
SEC Staff Accounting Bulletin (“SAB”) No. 118, in the fourth quarter of 2017 the Company recorded a charge of $47 million 
as a provisional reasonable estimate of the impact of the Tax Act, including $49 million for the Toll Charge net of $2 million 
for other net tax benefits. The Company is continuing to analyze the Tax Act and plans to finalize the estimate within the 
measurement period outlined in SAB No.118. The final charge may differ from the provisional reasonable estimate (and such 
difference  may  be  material)  if  provisions of  the  Tax  Act, and  their  interaction with  other provisions  of  the  U.S. Internal 
Revenue Code, are interpreted differently than interpretations made by the Company in determining the estimate, whether 
through issuance of administrative guidance, or through further review of the Tax Act by the Company and its advisors. 
Depending upon future interpretations and administrative guidance in respect of the Tax Act’s base broadening provisions, 
the Tax Act could have a material adverse effect on the Company’s effective tax rate and cash flows. 

The Company is subject to taxes in the U.S. and numerous non-U.S. jurisdictions. Therefore, it is subject to changes in tax 
laws in each of these jurisdictions and such changes could have a material adverse affect on the Company’s effective tax rate 
and cash flows. As a U.S. Company with significant non-U.S. operations (generally taxed at rates that are lower than the U.S. 
statutory  rate),  it  is  particularly  susceptible  to  changes  in  U.S.  tax  rules.  In  addition,  certain  non-U.S.  jurisdictions  are 
considering  tax  legislation  based  upon  recommendations  made  by  the  Organization  for  Economic  Co-operation  and 
Development in connection with its Base Erosion and Profit Shifting study. The outcome of these legislative developments 
could have a material adverse effect on the Company’s effective tax rate and cash flows.  

The  tax  rates  applicable  in  the  jurisdictions  within  which  the  Company  operates  vary  widely.  Therefore,  the  Company’s 
effective tax rate may be adversely affected by changes in the mix of its earnings by jurisdiction.  

The Company is also subject to examination of its tax returns by the U.S. Internal Revenue Service and other tax authorities 
and  governmental  bodies.  The  Company  regularly  assesses  the  likelihood  of  an  adverse  outcome  resulting  from  these 
examinations to determine the adequacy of its provision for income taxes. However, there can be no assurance as to the 
outcome of these examinations. 

A  decline  in  expected  profitability  of  the  Company  or  individual  reporting  units  of  the  Company  could  results  in  the 
impairment of assets, including goodwill and other long-lived assets. 

The Company holds material amounts of goodwill and other long-lived assets on its balance sheet. A decline in expected 
profitability,  particularly  if  there  is  a  decline  in  the  global  economy,  could  call  into  question  the  recoverability  of  the 
Company’s related goodwill and other long-lived tangible and intangible assets and require the write down or write off of 
these assets. Such an occurrence has had and could continue to have a material adverse effect on the Company’s consolidated 
results of operations, financial position and cash flows. 

A significant fluctuation between the U.S. dollar and other currencies could adversely impact the Company's revenue and 
earnings. 

Although the Company's financial results are reported in U.S. dollars, the majority of the Company’s operations consist of 
manufacturing and sales activities in foreign countries. The Company’s most significant net long exposure is to the euro. The 
9 

  
  
  
  
  
   
  
  
  
Company’s most significant net short exposures are to the Chinese renminbi, Mexican peso, and Philippine peso. Changes 
in foreign exchange rates and in particular, an increase in the value of the U.S. dollar against foreign currencies, could have 
an adverse effect on profitability and financial condition 

The Company’s revenues may vary significantly from period to period. 

The Company’s revenues may vary significantly from one accounting period to another due to a variety of factors including: 

changes in customers’ buying decisions; 
changes in demand for its products; 
changes in its distributor inventory stocking; 
the Company’s product mix; 
the Company’s effectiveness in managing manufacturing processes; 
costs and timing of its component purchases; 
the effectiveness of its inventory control; 
the degree to which it is able to utilize its available manufacturing capacity; 
the Company’s ability to meet delivery schedules; 

● 
● 
● 
● 
● 
● 
● 
● 
● 
●  general economic and industry conditions; 
● 

local conditions and events that may affect its production volumes, such as labor conditions and political instability;
and 
seasonality of certain product lines. 

● 

The bankruptcy or insolvency of a major customer could adversely affect the Company. 

The bankruptcy or insolvency of a major customer could result in lower sales revenue and cause a material adverse effect on 
the Company’s business, financial condition, and results of operations. In addition, the bankruptcy or insolvency of a major 
U.S.  auto  manufacturer  or  significant  supplier  likely  could  lead  to  substantial  disruptions  in  the  automotive  supply  base, 
resulting in lower demand for the Company’s products, which likely would cause a decrease in sales revenue and have a 
substantial adverse impact on the Company’s business, financial condition and results of operations. 

The Company is exposed to political, economic, and other risks that arise from operating a multinational business.  

The Company has significant operating activities in numerous countries around the globe that contribute significantly to its 
revenues and earnings. Serving a global customer base and remaining competitive in the global marketplace requires the 
Company  to  place  its  production  in  countries  outside  the  U.S.,  including  emerging  markets,  to  capitalize  on  market 
opportunities and maintain a cost-efficient structure. In addition, the Company sources a significant amount of raw materials 
and other components from third-party suppliers in low-cost countries. The Company’s operating activities are subject to a 
number of risks generally associated with multi-national operations, including risks relating to the following: 

currency fluctuations and exchange restrictions; 
import and export duties and restrictions; 
the imposition of tariffs and other import or export barriers; 
compliance with regulations governing import and export activities; 
current and changing regulatory requirements; 

●  general economic conditions; 
● 
● 
● 
● 
● 
●  political and economic instability; 
●  potentially adverse income tax consequences; 
transportation delays and interruptions; 
● 
● 
labor unrest; 
●  natural disasters; 
terrorist activities; 
● 
●  public health concerns; 
●  difficulties in staffing and managing multi-national operations; and 
● 

limitations on the Company’s ability to enforce legal rights and remedies. 

Any  of  these  factors  could  have  a  material  adverse  effect  on  the  Company’s  business,  financial  condition  and  results  of 
operations. 

10 

  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
Disruptions in the Company’s manufacturing, supply or distribution chain could result in an adverse impact on results 
of operations. 

The Company sources materials and sell product through various international network channels. A disruption could occur 
within the Company’s manufacturing, distribution or supply chain network. This could include damage or destruction due to 
various causes including natural disasters or political instability which would cause one or more of these network channels 
to become non-operational. This could adversely affect the Company’s ability to manufacture or deliver its products in a 
timely manner, impair its ability to meet customer demand for products and result in lost sales or damage to its reputation. 
Such  a  disruption  could  have  a  material  adverse  effect  upon  the  Company’s  business,  financial  condition  or  results  of 
operations. 

The inability to maintain access to capital markets may adversely affect the Company’s business and financial results. 

The Company’s ability to invest in its businesses, make strategic acquisitions, and refinance maturing debt obligations may 
require access to the capital markets and sufficient bank credit lines to support short-term borrowings. If the Company is 
unable to access the capital markets or bank credit facilities, it could experience a material adverse effect on its business, 
financial condition, and results of operations. 

Fixed costs may reduce operating results if sales fall below expectations. 

The Company’s expense levels are based, in part, on its expectations for future sales. Many of the Company’s expenses, 
particularly those relating to capital equipment and manufacturing overhead, are relatively fixed. The Company might be 
unable  to  reduce  spending  quickly  enough  to  compensate  for  reductions  in  sales.  Accordingly,  shortfalls  in  sales  could 
materially and adversely affect the Company’s operating results. 

The volatility of the Company’s stock price could affect the value of an investment in the Company’s stock and future 
financial position. 

The market price of the Company’s stock can fluctuate widely. Between December 31, 2016 and December 30, 2017, the 
closing sale price of the Company’s common stock ranged between a low of $146.94 and a high of $215.00. The volatility 
of the stock price may be related to any number of factors, such as volatility in the financial markets, general macroeconomic 
conditions, industry conditions, analysts’ expectations concerning the Company’s results of operations, or the volatility of its 
revenues as discussed above under “The Company’s Revenues May Vary Significantly from Period to Period.” The historic 
market price of the Company’s common stock may not be indicative of future market prices. The Company may not be able 
to sustain or increase the value of its common stock. Declines in the market price of the Company’s stock could adversely 
affect the Company’s ability to retain personnel with stock incentives, to acquire businesses or assets in exchange for stock 
and/or to conduct future financing activities with or involving the Company’s common stock. 

The Company is exposed to, and may be adversely affected by, potential security breaches or other disruptions to its 
information technology systems and data security.  

The Company relies on its information technology systems and networks in connection with many of its business activities. 
Some of these networks and systems are managed by third-party service providers and are not under the Company’s direct 
control. The Company’s operations routinely involve receiving, storing, processing and transmitting sensitive information 
pertaining to its business, customers, dealers, suppliers, employees, and other sensitive matters. As with most companies, the 
Company has experienced cyber-attacks, attempts to breach its systems, and other similar incidents, none of which have been 
material. Any future cyber incidents could, however, materially disrupt operational systems; result in loss of trade secrets or 
other  proprietary  or  competitively  sensitive  information;  compromise  personally  identifiable  information  regarding 
customers  or  employees;  and  jeopardize  the  security  of  the  Company’s  facilities.  A  cyber  incident  could  be  caused  by 
malicious outsiders using sophisticated methods to circumvent firewalls, encryption, and other security defenses. Because 
techniques used to obtain unauthorized access or to sabotage systems change frequently and generally are not recognized 
until they are launched against a target, the Company may be unable to anticipate these techniques or to implement adequate 
preventative measures. Information technology security threats, including security breaches, computer malware, and other 
cyber-attacks are increasing in both frequency and sophistication and could create financial liability, subject the Company to 
legal or regulatory sanctions or damage the Company’s reputation with customers, dealers, suppliers, and other stakeholders. 
The Company continuously seeks to maintain a robust program of information security and controls, but the impact of a 
material  information  technology  event  could  have  a  material  adverse  effect  on  the  Company’s  competitive  position, 
reputation, results of operations, financial condition, and cash flows. 

11 

  
  
  
  
  
  
  
   
  
  
The Company’s business may be interrupted by labor disputes or other interruptions of supplies. 

A  work  stoppage  could  occur  at  certain  of  the  Company’s  facilities,  most  likely  as  a  result  of  disputes  under  collective 
bargaining agreements or in connection with negotiations of new collective bargaining agreements. In addition, the Company 
may experience a shortage of supplies for various reasons, such as financial distress, work stoppages, natural disasters or 
production difficulties that may affect one of its suppliers. A significant work stoppage, or an interruption or shortage of 
supplies for any reason, if protracted, could substantially adversely affect the Company’s business, financial condition, and 
results of operations. The transfer of the Company’s manufacturing operations and changes in its distribution model could 
disrupt operations for a limited time. 

Failure to attract and retain qualified personnel could affect the Company’s business results.  

The Company’s success, both generally and in connection with mergers and acquisitions, depends on the Company’s ability 
to  attract,  retain,  and  motivate  a  highly-skilled  and  diverse  management  team  and  workforce.  Failure  to  ensure  that  the 
Company has the depth and breadth of personnel with the necessary skill set and experience could impede its ability to deliver 
growth objectives  and  execute  the  Company’s  strategy.  Competition  for  qualified  employees  among companies  that  rely 
heavily upon engineering and technology is at times intense, and the loss of qualified employees could hinder the Company’s 
ability to conduct research activities successfully and develop marketable products. 

Environmental liabilities could adversely impact the Company’s financial position. 

Foreign, federal, state and local laws and regulations impose various restrictions and controls on the discharge of materials, 
chemicals  and  gases  used  in  the  Company’s  manufacturing  processes  or  in  its  finished  goods.  These  environmental 
regulations have required the Company to expend a portion of its resources and capital on relevant compliance programs. 
Under these laws and regulations, the Company could be held financially responsible for remedial measures if its current or 
former properties are contaminated or if it sends waste to a landfill or recycling facility that becomes contaminated, even if 
the Company did not cause the contamination. The Company may be subject to additional common law claims if it releases 
substances that damage or harm third parties. In addition, future changes in environmental laws or regulations may require 
additional investments in capital equipment or the implementation of additional compliance programs. Any failure to comply 
with new or existing environmental laws or regulations could subject the Company to significant liabilities and could have a 
material adverse effect on its business, financial condition or results of operations. 

In  the  conduct  of  manufacturing  operations,  the  Company  has  handled  and  does  handle  materials  that  are  considered 
hazardous, toxic or volatile under federal, state, and local laws. The risk of accidental release of such materials cannot be 
completely eliminated. In addition, the Company operates or owns facilities located on or near real property that was formerly 
owned and operated by others. Certain of these properties were used in ways that involved hazardous materials. Contaminants 
may migrate from, within or through these properties. These releases or migrations may give rise to claims. Where third 
parties are responsible for contamination, the third parties may not have funds, or not make funds available when needed, to 
pay remediation costs imposed upon the Company under environmental laws and regulations. 

The  Company  is  responsible  for  the  maintenance  of  discontinued  coal  mining  operations  in  Germany.  The  risk  of 
environmental remediation exists and the Company is in the process of remediating the mines considered to be the most at 
risk. 

Customer  demands  and  new  regulations  related  to  conflict-free  minerals  may  force  the  Company  to  incur  additional 
expenses. 

The Dodd-Frank Wall Street Reform and Consumer Protection Act requires disclosure of use of “conflict” minerals mined 
from  the  Democratic  Republic  of  Congo  and  adjoining  countries  and  efforts  to  prevent  the  use  of  such  minerals.  In  the 
semiconductor  industry,  these  minerals  are  most  commonly  found  in  metals.  As  there  may  be  only  a  limited  number  of 
suppliers offering “conflict free” metals, the Company cannot be certain that it will be able to obtain necessary metals in 
sufficient quantities or at competitive prices. Also, the Company may face challenges with its customers and suppliers if it is 
unable to sufficiently verify that the metals used in its products are “conflict free.” 

The Company may not be successful protecting its patents and trademarks. 

The Company considers its intellectual property, including patents, trade names, and trademarks, to be of significant value 
to  its  business  as  a  whole.  The  Company’s  products  are  manufactured,  marketed,  and  sold  under  a  portfolio  of  patents,  

12 

  
  
  
  
  
  
  
   
  
  
  
 
trademarks, licenses, and other forms of intellectual property, some of which expire or are allowed to lapse at various dates 
in  the  future.  The  Company  develops  and  acquires  new  intellectual  property  on  an  ongoing  basis  and  consider  all  of  its 
intellectual property to be valuable. The Company's policy is to file applications and obtain patents for the great majority of 
its novel and innovative new products including product modifications and improvements. Based on the broad scope of its 
product lines, the Company believes that the loss or expiration of any single intellectual property right would not have a 
material adverse effect upon its business, financial condition or results of operations; however, multiple losses or expirations 
could have a material adverse effect upon the Company’s business, financial condition or results of operations. 

ITEM 1B. UNRESOLVED STAFF COMMENTS. 

None. 

ITEM 2. PROPERTIES.  

The Company’s operations are located in approximately 50 owned or leased facilities worldwide, totaling approximately 2.8 
million square feet. The Company’s owned facilities include approximately 1.8 million square feet and the Company’s leased 
facilities  include  approximately  1.0  million  square  feet.  The  Company’s  corporate  headquarters  is  located  in  the  U.S.  in 
Chicago, Illinois.  

The  Company’s  primary  North  American  manufacturing  facilities  include:  (i)  Saskatoon,  Canada  and  Rapid  City,  South 
Dakota  which  manufacture  products  for  the  Industrial  segment,  (ii)  Melchor  Muzquiz  and  Matamoros,  Mexico  which 
manufacture products primarily for the Automotive segment, and (iii) Piedras Negras, Mexico, which primarily manufactures 
products for the Automotive segment as well as the Industrial segment.  

The Company’s primary European manufacturing facilities include Kaunas, Lithuania, and Legnago and Ozegna, Italy, all 
of which manufacture products for the Automotive segment.  

The Company’s primary Asia-Pacific manufacturing facilities include: (i) Lipa City, Philippines, (ii) Inashiki, Japan, and (iii) 
Suzhou, Wuxi, Kunshan, Dongguan, and Shanghai, China, which manufacture products for the Electronics segment as well 
as the Automotive segment.  

The  Company  also  has  engineering  and  research  and  development,  sales,  and  distribution  centers  located  in  Asia,  North 
America, and Europe.  

The Company believes its facilities are adequate to meet its requirements for the foreseeable future. 

ITEM 3. LEGAL PROCEEDINGS. 

The Company is not a party to any material legal proceedings, other than routine litigation incidental to its business. 

ITEM 4. MINE SAFETY DISCLOSURES. 

Not applicable. 

13 

  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
PART II 

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS, AND 
ISSUER PURCHASES OF EQUITY SECURITIES. 

Market Information 

Shares of the Company’s common stock are traded under the symbol “LFUS” on the NASDAQ Global Select MarketSM.  

The table below provides information with respect to the Company’s quarterly stock prices and cash dividends declared and 
paid for each quarter during fiscal 2017 and 2016: 

4Q 

3Q 

2017 
2Q 

1Q 

4Q 

3Q 

2Q 

1Q 

2016 

High ...............................   $  215.00    $  199.26    $ 173.14    $ 167.21    $  156.54    $ 130.79    $ 123.15     $  124.59  
90.61  
Low ...............................      182.03       161.65       149.81       146.94       124.32       113.42       106.26       
Close .............................      197.82       195.88       165.00       159.91       151.77       128.81       116.56        123.40  
0.29  
Dividends ......................     

0.29       

0.33      

0.33      

0.37      

0.33      

0.37      

0.33      

Number of Holders  

As of February 16, 2018, there were 79 holders of record of the Company’s common stock.  

Dividend Policy 

The Company expects that its practice of paying quarterly dividends on its common stock will continue, although future 
dividend policy will be determined by the Board of Directors based upon its evaluation of earnings, cash availability, and 
general business prospects. Currently, there are restrictions on the payment of dividends contained in the Company’s credit 
agreements that relate to the maintenance of certain financial ratios. However, the Company expects to continue paying cash 
dividends on a quarterly basis for the foreseeable future.  

Recent Sales of Unregistered Securities  

There were no sales of unregistered securities by us or affiliates during the three months ended December 30, 2017. 

Purchases of Equity Securities 

The Company’s Board of Directors authorized the repurchase of up to 1,000,000 shares of the Company’s common stock 
under a program for the period May 1, 2017 to April 30, 2018. The Company did not repurchase any shares of its common 
stock during fiscal 2017 and 1,000,000 shares may yet be purchased under the program as of December 30, 2017. 

The table below presents shares of the Company’s common stock which were acquired by the Company during the three 
months ended December 30, 2017: 

Period 
October 1 through October 31  ..................     
November 1 through November 30  ..........     
December 1 through December 30  ...........     
Total  .........................................................     

Total number 
of shares 
purchased 

Average price 
paid per share     
—      
—      
—      
—      

—       
—       
—       
—       

Total number of 
shares purchased 
as part of publicly 
announced plans 
or programs 

Maximum 
number (or 
approximate 
dollar value) of 
shares that may 
yet be purchased 
under the plans or 
programs 

—      
—      
—      
—      

1,000,000  
1,000,000  
1,000,000  
1,000,000  

14 

  
  
  
  
  
  
    
  
    
    
  
  
  
    
    
    
    
    
    
    
  
  
  
  
  
  
  
  
  
  
  
  
    
    
  
   
 
 
Stock Performance Graph 

The following stock performance graph and related information shall not be deemed “soliciting material” or “filed” with 
the Securities and Exchange Commission, nor shall such information be incorporated by reference into any future filings 
under the Securities Act of 1933 or Securities Exchange Act of 1934, each as amended, except to the extent that the Company 
specifically incorporates it by reference into such filing.  

The following stock performance graph compares the five-year cumulative total return on Littelfuse common stock to the 
five-year  cumulative  total  returns  on  the  Russell  2000  Index  and  the  Dow  Jones  Electrical  Components  and  Equipment 
Industry Group Index. The Company believes that the Russell 2000 Index and the Dow Jones Electrical Components and 
Equipment  Industry  Group  Index  represent  a  broad  market  index  and  peer  industry  group  for  total  return  performance 
comparison. The stock performance shown on the graph below represents historical stock performance and is not necessarily 
indicative of future stock price performance.  

Littelfuse, Inc. ..................................................................   $ 
Russell 2000 .....................................................................     
Dow Jones US Electrical Components & Equipment ......     

   12/12       12/13       12/14       12/15       12/16       12/17    
337  
160    $ 
194  
146      
217  
149      

100    $ 
100      
100      

152    $ 
139      
138      

257    $ 
169      
171      

179    $ 
139      
141      

The Dow Jones Electrical Components and Equipment Industry Group Index includes the common stock of A. O. Smith 
Corp.; AAON, Inc.; American Superconductor Corp.; AMETEK, Inc.; Amphenol Corp.; Arrow Electronics, Inc.; Avnet, 
Inc.;  AVX  Corp.;  Capstone  Turbine  Corp.;  CTS  Corp.;  General  Cable  Corp.;  Hubbell  Inc.  Class  B;  Jabil  Circuit,  Inc.; 
KEMET Corp.; Littelfuse, Inc.; Methode Electronics, Inc.; Plexus Corp.; Powerwave Technologies, Inc.; Regal-Beloit Corp.; 
Vicor Corp.; and Vishay Intertechnology, Inc. 

15 

  
  
  
 
  
  
  
  
 
 
In the case of the Russell 2000 Index and the Dow Jones Electrical Components and Equipment Industry Group Index, a 
$100 investment made on December 29, 2012 and reinvestment of all dividends is assumed. In the case of the Company, a 
$100 investment made on December 29, 2012 is assumed. Returns for the Company’s fiscal years presented above are as of 
the last day of the respective fiscal year which was, December 28, 2013, December 27, 2014, January 2, 2016, December 31, 
2016, and December 30, 2017 for the fiscal years 2013, 2014, 2015, 2016, and 2017, respectively. 

ITEM 6. SELECTED FINANCIAL DATA. 

The information presented below provides selected financial data of the Company during the past five fiscal years and should 
be read in conjunction with Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations, 
and Item 8, Financial Statements and Supplementary Data, for the respective years presented: 

(in thousands, except per share data) 
Net sales ...............................................................   $ 1,221,534    $  1,056,159    $
413,117      
Gross profit ..........................................................     
130,644      
Operating income .................................................     
Net income ...........................................................     
104,488      
Per share of common stock: 
Income from continuing operations 

506,533      
218,511      
119,519      

2017 

2016 

2015 
867,864    $
330,499      
104,157      
80,866      

2014 
851,995    $
324,428      
133,830      
98,100      

2013 
757,853  
296,232  
129,881  
87,814  

3.94  
5.27      
- Basic ...........................................................     
3.90  
5.21      
- Diluted ........................................................     
0.84  
1.40      
Cash dividends paid .............................................     
Cash and cash equivalents ....................................     
305,192  
429,676      
Total assets ...........................................................      1,740,102       1,491,194       1,065,475       1,069,859       1,024,373  
126,000  
6,250      
Short-term debt .....................................................     
93,750  
489,361      
Long-term debt, less current portion ....................     

4.35      
4.32      
0.94      
297,571      

3.58      
3.56      
1.08      
328,786      

4.63      
4.60      
1.24      
275,124      

88,500      
105,691      

6,250      
447,892      

87,000      
83,753      

ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF 
OPERATIONS. 

The  following  discussion  of  Littelfuse’s  financial  condition  and  results  of  operations  should  be  read  together  with  the 
Consolidated Financial Statements and notes to those statements included in Item 8 of Part II of this Annual Report on Form 
10-K. 

Business 

For a description of the Company’s business, segments and product offerings, see Item 1, Business. 

2017 EXECUTIVE OVERVIEW 

Net sales increased by $165.4 million, or 15.7%, in 2017 compared to 2016. The increase in net sales was primarily driven 
by the acquisitions of ON Portfolio, PolySwitch, and U.S. Sensor, higher volume and growth across each of the Electronics 
segment reporting units and volume growth in the Automotive segment driven by increases in passenger car and commercial 
vehicle businesses.  

For the year ended December 30, 2017, the Company recognized net income of $119.5 million, or $5.21 per diluted share 
compared to net income of $104.5 million, or $4.60 per diluted share for the year ended December 31, 2016. Net income 
increased due to the impacts of the acquisitions and volume increases, higher gross profit largely driven by a favorable mix 
within  the  Electronics  segment,  a  $14.8  million  impairment  to  goodwill  and  other  intangible  assets  impairment  charge 
recorded in the Custom Products reporting unit in 2016 partially offset by higher income tax expense primarily driven by the 
enactment of the Tax Cuts and Jobs Act in December 2017.  

Net cash provided by operating activities was $269.2 million for the year ended December 30, 2017 as compared to $180.1 
million for the year ended December 31, 2016. The increase in net cash provided by operating activities reflected higher 
earnings, lower cash taxes, lower acquisition-related and integration payments and the impact of working capital changes 
largely driven by collections efficiency and lower vendor prepayments. 

On January 17, 2018, the Company acquired IXYS Corporation “IXYS”, a global pioneer in the power semiconductor and 
integrated  circuit  markets  with  a  focus  on  medium  to  high  voltage  power  control  semiconductors  across  the  industrial, 
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communications,  consumer  and  medical  markets.  IXYS  has  a  broad  customer  base,  serving  more  than  3,500  customers 
through its direct sales force and global distribution partners. The purchase price for IXYS was approximately $856.5 million, 
which  included  consideration  of  cash,  Littelfuse  common  stock,  and  the  value  of  converted  or  cash  settled  IXYS  equity 
awards. For the twelve months ended December 30, 2017, IXYS generated net sales of approximately $340 million. IXYS’ 
operations will be included in the Electronics segment. 

On July 7, 2017, the Company acquired the assets of U.S. Sensor for $24.3 million. The acquired business, which is included 
in the Electronics segment expands the Company’s existing sensor portfolio in several key electronics and industrial end 
markets. U.S. Sensor manufactures a variety of high quality negative temperature coefficient thermistors as well as thermistor 
probes and assemblies. Product lines also include thin film platinum resistance temperature detectors (“RTDs”) and RTD 
assemblies.  

On  February  28,  2017,  pursuant  to  a  Securities  Purchase  Agreement  between  the  Company  and  the  stockholders  of 
Monolith,  a  U.S.  start-up  Company  developing  silicon  carbide  technology,  and  conditioned  on  Monolith  achieving  a 
product  development  milestone  and  other  provisions,  the  Company  acquired  approximately  62%  of  the  outstanding 
common stock of Monolith for $15 million. This was in addition to the Company’s initial investment of $3.5 million in the 
preferred  stock  of  Monolith  Semiconductor  in  December  2015.  Monolith  operations  are  included  in  the  Electronics 
segment.  

On October 13, 2017, the Company amended its existing credit agreement to increase the unsecured revolving credit facility 
from $575.0 million to $700.0 million, increase the unsecured term loan credit facility from $125.0 million to $200.0 million 
and to extend the expiration date from March 4, 2021 to October 13, 2022. The credit agreement also includes the option for 
the Company to increase the size of the revolving credit facility and the term loan facility by up to an additional $300.0 
million, in the aggregate, subject to the satisfaction of certain conditions set forth in the credit agreement. Additionally, on 
November 15, 2017, the Company entered into a note purchase agreement pursuant to which the Company issued and sold 
$175 million in aggregate principal amount of senior notes. On January 16, 2018, $50 million in aggregate principal amount 
of 3.48% Senior Notes, Series A, due February 15, 2025 and $125 million in aggregate principal amount of 3.78% Senior 
Notes, Series B, due February 15, 2030 were funded.  

OUTLOOK 

Vision and Strategy 

The Company works with its customers to design and develop technologies that help them build safer, more reliable and 
more efficient products for the connected world in virtually every market that uses electrical energy, ranging across consumer 
electronics, IT and telecommunication applications, industrial electronics, automobiles and other transportation, and heavy 
industrial applications. Built upon that framework, the Company’s strategy is centered on growing its core circuit protection 
business, accelerating its growth in power control, and doubling its sensor platform.  

The Company’s strategic plan is focused on maximizing shareholder value by driving profitable sales growth, earnings per 
share growth, strong cash flow generation, and maintaining a balanced approach to capital allocation. The Company pursues 
the following major strategic initiatives, which are summarized below, along with more specific areas of focus. 

Strategic Objective 
Double digit sales growth 

2018 and Future Priorities 

  ●  Grow through increased product content with existing customers and increased market share 
  ●  Expand portfolio into new and underpenetrated geographies and end markets 
  ●  Increase innovation capabilities and investments 
  ●  Expand presence in products and applications that are converging across business segments 
  ●  Targeted mergers and acquisitions 

EPS growth 

  ●  Focus on higher profitability growth opportunities 
  ●  Grow operating margins through operational excellence 
  ●  Disciplined approach to managing costs 

Cash flow and liquidity 

  ●  Disciplined management of working capital 
  ●  Prudent deployment of capital 
  ●  Disciplined approach to mergers and acquisitions 
  ●  Grow dividend in line with earnings 
  ●  Periodic share repurchases 

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The Company’s strategy is to generate profitable sales growth. In order to accomplish this, The Company is focusing on 
accelerating  organic  growth  by  increasing  its  content  and  share  gains,  enhancing  technology  efforts  to  drive  innovation, 
capitalizing on cross segment opportunities, and gaining traction in underpenetrated geographies and markets. The Company 
will continue to make targeted strategic acquisitions that align to its strategy and financial targets to support new business, 
products, markets, and technologies while leveraging existing customers.  

Management believes that sustaining profitability through a combination of profitable organic growth and acquisitions is 
critical to the Company’s competitiveness, while enhancing value the Company delivers to its customers. In addition, the 
Company continues to implement initiatives across all platforms to enhance productivity while managing its cost structure, 
including integration of operations and streamlining administrative and support activities to drive operating margins. 

The Company seeks to deploy its capital using a balanced approach. Priorities for capital deployment, over time, include 
investments  to  drive  increased  organic  growth,  targeted  acquisitions  that  align  to  the  Company’s  strategic  and  financial 
metrics and returning capital to shareholders through dividends and periodic share repurchases.  

The  Company  uses  several  key  indicators  to  gauge  progress  toward  achieving  these  objectives.  These  indicators  include 
organic sales growth, operating margins, cash flow from operations and capital expenditures. The Company targets long-
term sales double digit sales growth, split between 5-7% annual organic sales growth and 5-7% annual growth from strategic 
acquisitions, while targeting operating margins between 17% and 19% and double-digit earnings per share growth. Cash flow 
from operations less capital expenditures is targeted to approximate net income but in any given year can be significantly 
impacted by the timing of non-recurring or infrequent expenditures. 

Significant Accounting Policies and Critical Estimates  

Critical Accounting Policies and Estimates 

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions 
that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the 
financial statements and the reported amounts of revenues and expenses during the reporting period. The Company’s most 
critical  accounting  policies  are  those  that  are  most  important  to  the  portrayal  of  its  financial  condition  and  results  of 
operations, and which require the Company to make its most difficult and subjective judgments, often as a result of the need 
to make estimates of matters that are inherently uncertain. The Company has identified the following as its most critical 
accounting policies and judgments. Although management believes that its estimates and assumptions are reasonable, they 
are based upon information available when they are made, and therefore, actual results may differ from these estimates under 
different assumptions or conditions. The Company has reviewed these critical accounting policies and related disclosures 
with the Audit Committee of its Board of Directors. Significant accounting policies are more fully described in the Notes to 
Consolidated Financial Statements included elsewhere in this Annual Report.  

Net Sales 

Revenue Recognition: The Company recognizes revenue on product sales in the period in which the sales process is complete. 
This generally occurs when persuasive evidence of an arrangement exists, products are shipped (FOB origin) to the customer 
in accordance with the terms of the sale, the risk of loss has been transferred, collectability is reasonably assured and the 
pricing is fixed and determinable. At the end of each period, for those shipments where title to the products and the risk of 
loss and rewards of ownership do not transfer until the product has been received by the customer, the Company adjusts sales 
and cost of sales for the delay between the time that the products are shipped and when they are received by the customer. 
The Company’s distribution channels are primarily through direct sales and independent third-party distributors.  

Revenue and Billing: The Company accepts orders from customers based on long term purchasing contracts and written sales 
agreements.  Contract  pricing  and  selling  agreement  terms  are  based  on  market  factors,  costs,  and  competition.  Pricing 
normally is negotiated as an adjustment (premium or discount) from the Company’s published price lists. The customer is 
invoiced when the Company’s products are shipped to them in accordance with the terms of the sales agreement. 

Returns  and  Credits:  Some  of  the  terms  of  the  Company’s  sales  agreements  and  normal  business  conditions  provide 
customers (distributors) the ability to receive price adjustments on products previously shipped and invoiced. This practice 
is common in the industry and is referred to as a “ship and debit” program. This program allows the distributor to debit the 
Company  for  the  difference  between  the  distributors’  contracted  price  and  a  lower  price  for  specific  transactions.  Under 
certain circumstances (usually in a competitive situation or large volume opportunity), a distributor will request authorization  

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to reduce its price to its buyer. If the Company approves such a reduction, the distributor is authorized to “debit” its account 
for the difference between the contracted price and the lower approved price. The Company establishes reserves for this 
program based on historic activity and actual authorizations for the debit and recognizes these debits as a reduction of revenue.  

Return  to  Stock:  The  Company  has  a  return  to  stock  policy  whereby  a  customer,  with  previous  authorization  from 
management,  can  return  previously  purchased  goods  for  full  or  partial  credit.  The  Company  establishes  an  estimated 
allowance for these returns based on historic activity. Sales revenue and cost of sales are reduced to anticipate estimated 
returns.  

Volume Rebates: The Company offers incentives to certain customers to achieve specific quarterly or annual sales targets. If 
customers achieve their sales targets, they are entitled to rebates. The Company estimates the future cost of these rebates and 
recognizes this estimated cost as a reduction to revenue as products are sold. 

Allowance for Doubtful Accounts: The Company evaluates the collectability of its trade receivables based on a combination 
of factors. The Company regularly analyzes its significant customer accounts and, when the Company becomes aware of a 
specific customer’s inability to meet its financial obligations, the Company records a specific reserve for bad debt to reduce 
the related receivable to the amount the Company reasonably believes is collectible. The Company also records allowances 
for all other customers based on a variety of factors including the length of time the receivables are past due, the financial 
health of the customer, macroeconomic considerations and past experience. Historically, the allowance for doubtful accounts 
has been adequate to cover bad debts. If circumstances related to specific customers change, the estimates of the recoverability 
of receivables could be further adjusted.  

Inventory 

The Company performs regular detailed assessments of inventory, which include a review of, among other factors, demand 
requirements, product life cycle and development plans, component cost trends, product pricing, shelf life, and quality issues. 
Based on the analysis, the Company records adjustments to inventory for excess quantities, obsolescence or impairment when 
appropriate to reflect inventory at net realizable value. Historically, inventory reserves have been adequate to reflect inventory 
at  net  realizable  values.  During  2017,  the  Company  was  required  to  step  up  the  value  of  inventory  acquired  in  business 
combinations to its selling prices less the cost to sell under business combination accounting. This step-up was approximately 
$1.6 million for the U.S. Sensor acquisition in 2017.  

Goodwill  

The Company’s methodology for allocating the purchase price of acquisitions is based on established valuation techniques 
that  reflect  the  consideration  of  a  number  of  factors,  including  valuations  performed  by  third-party  appraisers  when 
appropriate. Goodwill is measured as the excess of the cost of an acquired entity over the fair value assigned to identifiable 
assets acquired and liabilities assumed. Based on its current organization structure, the Company has seven reporting units 
for  which  cash  flows  are determinable  and  to  which goodwill  has be  allocated. Goodwill  is  either  assigned  to  a  specific 
reporting unit or allocated between reporting units based on the relative excess fair value of each reporting unit. 

The Company annually tests goodwill for impairment on the first day of its fiscal fourth quarter, or more frequently if an 
event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its 
carrying value. The Company also performs an interim review for indicators of impairment each quarter to assess whether 
an interim impairment review is required for any reporting unit. As part of its interim reviews, management analyzes potential 
changes in the value of individual reporting units based on each reporting unit’s operating results for the period compared to 
expected results as of the prior year’s annual impairment test. In addition, management considers how other key assumptions, 
including discount rates and expected long-term growth rates, used in the last annual impairment test, could be impacted by 
changes in market conditions and economic events. Based on the interim assessments, management concluded that no events 
or changes in circumstances indicated that it was more likely than not that the fair value for any reporting unit had declined 
below its carrying value 

Quantitative Assessment for Impairment 

For the seven reporting units with goodwill, the Company compared the estimated fair value of each reporting unit to its 
carrying value. If the carrying value of a reporting unit exceeded the estimated fair value, the difference between the estimated 
fair  value  and  carrying  value  is  recorded  as  the  amount  of  the  goodwill  impairment  charge.  The  results  of  the  goodwill 
impairment  test  as  of  October  1,  2017  indicated  that  the  estimated  fair  values  for  each  of  the  seven  reporting  units  with 

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goodwill exceeded their respective carrying values. Accordingly, there were no goodwill impairment charges recorded as 
part of the Company’s 2017 annual goodwill impairment test. 

As part of its impairment test for these reporting units, the Company engaged a third-party appraisal firm to assist in the 
Company’s determination of the estimated fair values. This determination included estimating the fair value of each reporting 
unit  using  both  the  income  and  market  approaches.  The  income  approach  requires  management  to  estimate  a  number  of 
factors for each reporting unit, including projected operating results, economic projections, anticipated future cash flows, 
discount rates and the allocation of shared or corporate items. The market approach estimates fair values using comparable 
marketplace fair value data from within a comparable industry grouping. The Company weighted both the income and market 
approach equally to estimate the concluded fair value of each reporting unit. The determination of fair value requires the 
Company to make significant estimates and assumptions, which primarily include, but are not limited to: the selection of 
appropriate  peer  group  companies;  control  premiums  appropriate  for  acquisitions  in  which  the  Company  competes;  the 
discount rate; terminal growth rates; and forecasts of revenue, operating income, depreciation and amortization and capital 
expenditures.  

Goodwill Impairment Assumptions 

Although the Company believes its estimates of fair value are reasonable, actual financial results could differ from those 
estimates  due  to  the  inherent  uncertainty  involved  in  making  such  estimates.  Changes  in  assumptions  concerning  future 
financial results or other underlying assumptions could have a significant impact on the fair value of the reporting units. 
Future declines in the overall market value of the Company’s equity may also result in a conclusion that the fair value of one 
or more reporting units has declined below its carrying value. 

One measure of the sensitivity of the amount of goodwill impairment charges to key assumptions is the amount by which 
each reporting unit “passed” (fair value exceeds the carrying value”) the goodwill impairment test. All seven of the reporting 
units passed the goodwill impairment test, with fair values that exceeded the carrying values by between 25% and 314% of 
their respective estimated fair values. As of the most recent annual test conducted on October 1, 2017, the Company noted 
that the excess of fair value over the carrying value, was 161%, 314%, 247%, 218%, 100%, 25%, and 248% for its reporting 
units: Electronics (non-silicon), Electronics (silicon), Passenger Car, Commercial Vehicle Products, Sensors, Relays, and 
Power  Fuse,  respectively.  Relatively  small  changes  in  the  Company’s  key  assumptions  would  not  have  resulted  in  any 
reporting units failing the goodwill impairment test.  

Generally, changes in estimates of expected future cash flows would have a similar effect on the estimated fair value of the 
reporting unit. That is, a 1.0% decrease in estimated annual future cash flows would decrease the estimated fair value of the 
reporting unit by approximately 1.0%. The estimated long-term net sales growth rate can have a significant impact on the 
estimated future cash flows, and therefore, the fair value of each reporting unit. A 1.0% decrease in the long-term net sales 
growth rate would have resulted in no reporting units failing the goodwill impairment test. Of the other key assumptions that 
impact the estimated fair values, most reporting units have the greatest sensitivity to changes in the estimated discount rate. 
The estimated discount rate was 9.6% for all reporting units except for Relays which had a discount rate of 10.1%. A 1.0% 
increase in the estimated discount rates would have resulted in no reporting units failing the annual goodwill impairment test. 
The Company believes that its estimates of future cash flows and discount rates are reasonable, but future changes in the 
underlying  assumptions  could  differ  due  to  the  inherent  uncertainty  in  making  such  estimates.  Additionally,  price 
deterioration or lower volume could have a significant impact on the fair values of the reporting units. 

Long-Lived Assets 

The Company evaluates the recoverability of other long-lived assets, including property, plant and equipment and certain 
identifiable intangible assets, whenever events or changes in circumstances indicate that the carrying value of an asset or 
asset group may not be recoverable. Factors which could trigger an impairment review include significant underperformance 
relative to historical or projected operating results, significant changes in the manner of use of the assets or the strategy for 
the overall business, a significant decrease in the market value of the assets or significant negative industry or economic 
trends. When the Company determines that the carrying value of long-lived assets may not be recoverable based upon the 
existence of one or more of the indicators, the assets are assessed for impairment based on the estimated future undiscounted 
cash flows expected to result from the use of the asset and its eventual disposition. If the carrying value of an asset exceeds 
its estimated future undiscounted cash flows, an impairment loss is recorded for the excess of the asset’s carrying value over 
its fair value. During the year ended December 30, 2017, the Company recognized non-cash impairment charges of $2.9 
million  related  to  certain  machinery  and  equipment  in  the  Electronics  and  Automotive  segments  due  to  changes  in  the 
expected  use  of  these  certain  assets.  During  the  year  ended  December  31,  2016,  the  Company  recognized  non-cash  

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impairment charges totaling $6.0 million, of which $2.2 million related to the impairment of certain customer relationship 
intangible  assets  in  the  Custom  Products  reporting  unit  within  the  Industrial  segment  and  $3.8  million  related  to  the 
impairment of the Custom Products tradename. The impairment of the customer relationship intangible assets resulted from 
lower expectations of future revenue to be derived from those relationships while the tradename impairment resulted from 
lower expectations of future cash flows of the Custom Products reporting unit.  

Environmental Liabilities 

Environmental liabilities are accrued based on estimates of the probability of potential future environmental exposure. Costs 
related to on-going maintenance of environmental sites are expensed as incurred. If actual or estimated probable future losses 
exceed  the  Company’s  recorded  liability  for  such  claims, it  would record  additional  charges  as  other  expense during  the 
period in which the actual loss or change in estimate occurred. The Company evaluates its reserve for coal mine remediation 
annually utilizing a third party expert. 

Pension and Supplemental Executive Retirement Plan 

The Company records annual income and expense amounts relating to its pension and postretirement benefits plans based on 
calculations which include various actuarial assumptions including discount rates, expected long-term rates of return and 
compensation increases. The Company reviews its actuarial assumptions on an annual basis as of the fiscal year-end balance 
sheet date (or more frequently if a significant event requiring remeasurement occurs) and modifies the assumption based on 
current  rates  and  trends  when  it  is  appropriate  to  do  so.  The  effects  of  modifications  are  recognized  immediately  on  the 
Consolidated  Balance  Sheets,  but  are  generally  amortized  into  operating  earnings  over  future  periods,  with  the  deferred 
amount recorded in accumulated other comprehensive income (loss). The Company believes that the assumptions utilized in 
recording its obligations under its plans are reasonable based on its experience, market conditions and input from its actuaries 
and investment advisors. The Company maintains several pension plans in international locations. The expected returns on 
plan  assets  and  discount  rates  are  determined  based  on  each  plan’s  investment  approach,  local  interest  rates  and  plan 
participant profiles. The discount rates for the Company’s defined benefit plans primarily in Europe and the Asia-Pacific 
regions at December 30, 2017 and December 31, 2016 were 3.1% and 2.6%, respectively. During 2015, the Company settled 
its U.S. defined benefit pension plan as described in Note 8, Benefit Plans, of the Notes to Consolidated Financial Statements 
included in this Annual Report.  

A 50 basis point change in the discount rates at December 30, 2017 would have the following effect on the projected benefit 
obligation: 

(in millions) 
Projected benefit obligation .............................................................................................   $ 

0.5%  
Increase 

0.5%  
Decrease 

(5.6 )   $

6.2  

Equity-based Compensation 

Equity-based compensation expense is recorded for stock-option awards and restricted share units based upon the fair values 
of the awards. The fair value of stock-option awards is estimated at the grant date using the Black-Scholes option pricing 
model, which includes assumptions for volatility, expected term, risk-free interest rate and dividend yield. Expected volatility 
is  based  on  implied  volatilities  from  traded  options  on  Littelfuse  stock,  historical  volatility  of  Littelfuse  stock  and  other 
factors. Historical data is used to estimate employee termination experience and the expected term of the options. The risk-
free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. The Company initiated a quarterly 
cash dividend in 2010 and expects to continue making cash dividend payments in the foreseeable future.  

Total  equity-based  compensation  expense  for  all  equity  compensation  plans was $17.3  million,  $12.8  million,  and  $10.7 
million  in  2017,  2016,  and  2015,  respectively.  Further  information  regarding  this  expense  is  provided  in  Note  9, 
Shareholders’ Equity, of the Notes to Consolidated Financial Statements included in this Annual Report. 

Income Taxes 

The Company accounts for income taxes using the liability method. Deferred taxes are recognized for the future effects of 
temporary  differences  between  financial  and  income  tax  reporting  using  tax  rates  in  effect  for  the  years  in  which  the 
differences  are  expected  to  reverse.  The  Company  recognizes  deferred  taxes  for  temporary  differences,  operating  loss 
carryforwards and tax credit carryforwards. Deferred tax assets are reduced by a valuation allowance if it is more likely than  

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not that some portion, or all, of the deferred tax assets will not be realized. U.S. state and non-U.S. income taxes are provided 
on the portion of foreign income that is expected to be remitted to the U.S. and be taxable (and non-U.S. income taxes are 
provided on the portion of non-U.S. income that is expected to be remitted to an upper-tier non-U.S. entity). 

Deferred income taxes are not provided on the excess of the investment value for financial reporting over the tax basis of 
investments  in  those  non-U.S.  subsidiaries  for  which  such  excess  is  considered  to  be  permanently  reinvested  in  those 
operations. The  Company  recognized  deferred  tax  liabilities  of $12.0  million  ($11.8  million  for non-U.S.  taxes  and  $0.2 
million for U.S. state taxes) as of December 30, 2017 related to taxes on certain non-U.S. earnings which are not considered 
to  be  permanently  reinvested.  Management  regularly  evaluates  whether  foreign  earnings  are  expected  to  be  permanently 
reinvested.  This  evaluation  requires  judgment  about  the  future  operating  and  liquidity  needs  of  the  Company’s  non-U.S. 
subsidiaries. Changes in economic and business conditions, foreign or U.S. tax laws (such as the Tax Act), or the Company’s 
financial situation could result in changes to these judgments and the need to record additional tax liabilities. 

In accordance with the guidance provided in SEC SAB No. 118, in the fourth quarter of 2017 the Company recorded a charge 
of $47 million as a provisional reasonable estimate of the impact of the Tax Act, including $49 million for the Toll Charge 
net of $2 million for other net tax benefits. The Company is continuing to analyze the Tax Act and plans to finalize the 
estimate within the measurement period outlined in SAB No.118. The final charge may differ from the provisional reasonable 
estimate  if  provisions  of  the Tax  Act,  and  their  interaction with other provisions  of  the  U.S. Internal  Revenue  Code,  are 
interpreted differently than interpretations made by the Company in determining the estimate, whether through issuance of 
administrative  guidance,  or  through  further  review  of  the  Tax  Act  by  the  Company  and  its  advisors.  Aside  from  these 
interpretation issues, the final charge may differ from the provisional reasonable estimate due to refinements of accumulated 
non-U.S. earnings and tax pool data.  

The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position 
will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits 
recognized in the financial statements from such a position are measured based on the largest benefit that has a greater than 
50% likelihood of being realized upon ultimate settlement. 

Further information regarding income taxes, including a detailed reconciliation of current year activity, is provided in Note 
10, Income Taxes, of the Notes to Consolidated Financial Statements included in this Annual Report. 

Off-Balance Sheet Arrangements 

Other  than  non-cancellable  operating  lease  commitments,  the  Company  does  not  have  off-balance  sheet  arrangements, 
financings or special purpose entities. 

Financial Review 

In the financial review that follows, the Company discusses its consolidated results of operations, financial position, cash 
flows  and  certain  other  information.  This  discussion  should  be  read  in  conjunction  with  the  Company’s  Consolidated 
Financial Statements and related notes that begin on page F-1. 

RESULTS OF OPERATIONS FOR THE YEAR ENDED DECEMBER 30, 2017 AS COMPARED TO THE YEAR 
ENDED DECEMBER 31, 2016 

The following table summarizes the Company’s consolidated results of operations for periods presented. The fiscal year 2017 
includes  approximately  $10.3  million  of  non-segment  charges.    These  included  acquisition-related  and  integration  costs 
related to legal, accounting and other expenses associated with completed or pending acquisitions of approximately $8.0 
million, including $1.6 million of purchase accounting inventory charges related to the Company’s 2017 acquisition of U.S. 
Sensor as described in Note 2, Acquisitions and Dispositions, of the Notes to the Consolidated Financial Statements included 
in this Annual Report, and $2.2 million of charges related to restructuring and production transfers in the Company’s Asia 
operations. 

The fiscal year 2016 includes approximately $50.0 million of non-segment charges.  These included $14.8 million of charges 
related to the impairment of the Custom Products reporting unit, $21.4 million of acquisition and integration costs associated 
with the Company’s 2016 acquisitions, primarily PolySwitch, $7.8 million of non-cash fair value step-up inventory charges 
relating to the Company’s 2016 acquisitions, primarily PolySwitch, as described in Note 2, Acquisitions and Dispositions, of 
the Notes to Consolidated Financial Statements included in this Annual Report, $1.9 million in charges related to the closure 

22 

  
  
  
  
   
  
  
  
  
  
  
of  the  Company’s  manufacturing  facility  in  Denmark,  $1.6  million  related  to  the  Company’s  transfer  of  its  reed  sensor 
manufacturing operations from the U.S. and China to the Philippines, and $2.5 million related to restructuring costs. 

Fiscal year 2017 also included approximately $2.4 million in foreign currency expenses primarily attributable to changes in 
the value of the euro, Philippine peso and Chinese renminbi against the U.S. dollar, while fiscal year 2016 also included 
approximately $0.5 million in foreign currency expenses primarily attributable to changes in the value of the euro, Philippine 
peso and Chinese renminbi against the U.S. dollar. 

(in thousands, except % change) 
Sales ............................................................................    $ 
Gross profit .................................................................   
Operating expenses .....................................................   
Operating income ........................................................   
Other expense (income), net ........................................   
Income before income taxes ........................................   
Income taxes ...............................................................   
Net income ..................................................................   

Fiscal Year 

2017 
1,221,534    $ 
506,533      
288,022      
218,511      
(1,282)     
204,037      
84,518      
119,519      

2016 
1,056,159     $ 
413,117       
282,473       
130,644       
(1,730)      
123,274       
18,786       
104,488       

Change 

     % Change    

165,375    
93,416    
5,549    
87,867    
(448)   
80,763    
65,732    
15,031    

15.7% 
22.6% 
2.0% 
67.3% 
(25.9%)    
65.5% 
349.9% 
14.4% 

Sales 

Net sales for 2017 of $1,221.5 million increased $165.4 million, or 15.7%, compared to the prior year, resulting from the 
prior  year  acquisitions  of  PolySwitch,  ON  Portfolio,  and  Menber’s  and  $5.4  million  from  the  current  year  U.S.  Sensor 
acquisition. The remaining increase in net sales was primarily due to higher volume across all product lines in the Electronics 
segment  and  passenger  car  and  commercial  vehicle  businesses  within  the  Automotive  segment  partially  offset  by  the 
divestitures of two non-core product lines within the Industrial segment in 2016.  

Gross Profit 

Gross profit was $506.5 million, or 41.5% of sales, in 2017, compared to $413.1 million, or 39.1% of sales, in 2016. The 
increase in gross profit and gross margin reflects the incremental net sales and improved leverage in expenses and profits 
related to the prior year acquisitions, primarily in the Electronics segment. 

Operating Expenses 

Total operating expenses were $288.0 million, or 23.6% of net sales, for 2017 compared to $282.5 million, or 26.7% of net 
sales, for 2016. The increase in operating expenses of $5.5 million was primarily due to acquisitions, higher selling costs, 
higher research and development costs of $8.3 million and an increase of $5.4 million in amortization expense of intangible 
assets due to the acquisitions, partially offset by the $14.8 million of goodwill and other intangible asset impairment charges 
recognized  in  2016  and  lower  acquisition-related  expenses  and  integration  costs  of  $13.4  million.  Selling,  general  and 
administrative expenses increased by $6.7 million to $212.8 million, but decreased from 19.5% to 17.4% as a percentage of 
net sales for 2017 compared to 2016 primarily as a result of lower acquisition-related expenses and integration costs of $13.4 
million and cost control initiatives partially offset by the acquisitions. 

Operating Income 

Operating income for 2017 was $218.5 million, an increase of $87.9 million or 67.3% compared to $130.6 million for 2016. 
The increase in operating income was the result of acquisitions and higher volume in the Electronics segment. Operating 
margins increased from 12.4% to 17.9% for 2017 due to the acquisitions, improvement in gross margins primarily driven by 
the Electronics segment, lower acquisition and integration related costs, the prior year goodwill and other intangible asset 
impairment charge and operational efficiencies. Also, the prior year goodwill and other intangible asset impairment charge 
reduced the operating margin by 1.4% in 2016. 

Income Before Income Taxes 

Income before income taxes for 2017 was $204.0 million, or 16.7% of net sales compared to $123.3 million, or 11.7% of net 
sales, for 2016. Income before income taxes was impacted by an increase in operating income described above, partially 
offset by higher interest expense of $4.8 million reflecting increased borrowings and unfavorable changes in foreign exchange 

23 

  
  
  
  
       
  
    
  
  
  
  
    
    
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
rates of $1.9 million primarily as a result of fluctuations in the Chinese renminbi and Philippine peso against the U.S. dollar 
partially offset by fluctuations in the Euro against U.S. dollar. 

Income Taxes 

Income tax expense for 2017 was $84.5 million, or an effective tax rate of 41.4% compared to income tax expense of $18.8 
million, or an effective tax rate of 15.2%, for 2016. The increase in 2017 reflects a fourth quarter charge of $47 million as a 
provisional reasonable estimate of the impact of the Tax Act, including $49 million for the Toll Charge net of $2 million for 
other  net  tax  benefits.  The  Company  is  continuing  to  analyze  the  Tax  Act  and  plans  to  finalize  the  estimate  within  the 
measurement  period  outlined  in  SAB  No.118.  The  final  charge  may  differ  from  the  provisional  reasonable  estimate  if 
provisions of the Tax Act, and their interaction with other  provisions of the U.S. Internal Revenue Code, are interpreted 
differently than interpretations made by the Company in determining the estimate, whether through issuance of administrative 
guidance, or through further review of the Tax Act by the Company and its advisors. Aside from these interpretation issues, 
the final charge may differ from the provisional reasonable estimate due to refinements of accumulated non-U.S. earnings 
and tax pool data. Excluding the impact of the Tax Act, the effective tax rates for 2017 and 2016 are lower than the U.S. 
statutory tax rate primarily due to income earned in lower tax jurisdictions partially offset by the impact of taxes on unremitted 
earnings, and, with respect to 2016, a one-time deduction with respect to the stock of one of the Company’s affiliates, partially 
offset by the impact of the impairment of goodwill for which no tax benefit was recorded. 

Segment Information 

The Company reports its operations by the following segments: Electronics, Automotive and Industrial. Segment information 
is described more fully in Note 12, Segment Information, of the Notes to Consolidated Financial Statements included in this 
Annual Report. 

The following table is a summary of the Company’s net sales by segment: 

(in millions) 
Electronics ....................................................................................    $
Automotive ...................................................................................      
Industrial ......................................................................................      
Total ......................................................................................    $

Electronics Segment 

Fiscal Year 

2017 

2016 

     Change 

661.9     $
453.2       
106.4       
1,221.5     $

535.2     $ 
415.2       
105.8       
1,056.2     $ 

     % Change   
23.7%
9.2%
0.6%
15.7%

126.7      
38.0      
0.6      
165.3      

The  Electronics  segment  net  sales  increased  $126.7  million,  or  23.7%,  in  2017  compared  to  2016  primarily  due  to  the 
PolySwitch, and ON Portfolio acquisitions in 2016, and the U.S Sensor acquisition in 2017 along with higher volume across 
the passives, sensors and semiconductor product lines.  

Automotive Segment  

Net  sales  in  the  Automotive  segment  increased  $38.0  million,  or  9.2%,  in  2017  compared  to  2016  primarily  due  to  the 
incremental net sales associated with the PolySwitch and Menber’s acquisitions in 2016, higher volume in passenger car and 
commercial vehicle products and favorable foreign exchange impacts of $1.9 million, partially offset by lower volume in 
automotive sensor products.  

Industrial Segment  

The Industrial segment net sales increased $0.6 million, or 0.6%, in 2017 compared to 2016 primarily due higher volume 
across all product lines, partially offset by the divestiture of two non-core product lines, one in the fourth quarter of 2016 and 
the other in the first quarter of 2016. 

24 

  
  
  
  
  
  
  
  
      
  
      
  
  
  
    
  
  
  
  
   
  
  
 
 
Geographic Sales Information 

Sales by geography represent sales to customer or distributor locations. The following table is a summary of the Company’s 
net sales by geography: 

(in millions) 
Americas ..............................................................................   $ 
Europe ..................................................................................     
Asia-Pacific ..........................................................................     
Total ..............................................................................   $ 

2017 

2016 

     Change 

     % Change    

436.5     $ 
243.9       
541.1       
1,221.5     $ 

411.1    $ 
200.3      
444.8      
1,056.2    $ 

25.4      
43.6      
96.3      
165.3      

6.2% 
21.8% 
21.7% 
15.7% 

Fiscal Year 

Americas  

Net sales in the Americas increased $25.4 million, or 6.2%, in 2017 compared to 2016 resulting from acquisitions and higher 
volume in the passive and semiconductor product lines in the Electronics segment and the passenger car and commercial 
vehicle businesses in the Automotive segment that were partially offset by lower volume in sensor products in the Automotive 
segment and the divestiture of a non-core product line in the Industrial segment. 

Europe  

European net sales increased $43.6 million, or 21.8%, in 2017 compared to 2016. The increase in net sales was primarily due 
to  acquisitions  and  increased  net  sales  across  all  product  lines  in  the  Electronics  segment  and  the  passenger  car  and 
commercial vehicle products businesses in the Automotive segment.  

Asia-Pacific  

Asia-Pacific net sales increased $96.3 million, or 21.7%, in 2017 compared to 2016, primarily due to incremental net sales 
from prior year acquisitions and increased volume across all product lines in the Electronics segment.  

RESULTS OF OPERATIONS FOR THE YEAR ENDED DECEMBER 31, 2016 AS COMPARED TO THE YEAR 
ENDED JANUARY 2, 2016 

The following table summarizes the Company’s consolidated results of operations for periods presented. The fiscal year 2016 
includes  approximately  $50.0  million  of  non-segment  charges.    These  included  $14.8  million  of  charges  related  to  the 
impairment  of  the  Custom  Products  reporting  unit, $21.4 million of  acquisition  and  integration  costs  associated with  the 
Company’s 2016 acquisitions, primarily PolySwitch, $7.8 million of non-cash fair value step-up inventory charges relating 
to the Company’s 2016 acquisitions, primarily PolySwitch, as described in Note 2, Acquisitions and Dispositions, of the 
Notes to Consolidated Financial Statements included in this Annual Report, $1.9 million in charges related to the closure of 
the  Company’s  manufacturing  facility  in  Denmark,  $1.6  million  related  to  the  Company’s  transfer  of  its  reed  sensor 
manufacturing operations from the U.S. and China to the Philippines, and $2.5 million related to restructuring costs.   

Fiscal year 2015 includes approximately $45.2 million of other non-segment charges.  These included $5.2 million related to 
the Company’s transfer of its reed sensor manufacturing operations from the U.S. and China to the Philippines, $3.6 million 
related  to  restructuring,  $4.6  million  related  to  acquisition  costs  and  $31.9  million  of  expense  related  to  the  planned 
termination of the U.S. pension as described in Note 8, Benefit Plans, of the Notes to Consolidated Financial Statements 
included in this Annual Report. 

Fiscal year 2016 also included approximately $0.5 million in foreign currency expenses primarily attributable to changes in 
the value of the euro, Philippine peso and Chinese renminbi against the U.S. dollar, while fiscal year 2015 also included $1.5 
million in foreign currency gains primarily attributable to changes in the value of both the euro and Philippine peso against 
the U.S. dollar. 

25 

  
  
  
  
      
  
      
  
  
  
    
  
  
  
  
  
  
  
  
  
  
  
 
 
Fiscal Year 

2016 

(in thousands, except % change) 
Sales .............................................................................................   $  1,056,159    $
413,117      
Gross profit ..................................................................................     
282,473      
Operating expenses ......................................................................     
130,644      
Operating income .........................................................................     
(1,730)     
Other expense (income), net .........................................................     
123,274      
Income before income taxes .........................................................     
18,786      
Income taxes ................................................................................     
104,488      
Net income ...................................................................................     

Sales 

2015 
867,864    $
330,499      
226,342      
104,157      
(5,417)     
106,948      
26,082      
80,866      

     Change 

     % Change   

188,295       
82,618       
56,131       
26,487       
3,687       
16,326       
(7,296 )     
23,622       

21.7% 
25.0% 
24.8% 
25.4% 
(68.1%) 
15.3% 
(28.0%) 
29.2% 

Net sales for 2016 of $1,056.2 million increased $188.3 million, or 21.7%, compared to the prior year, reflecting $170.2 
million  of  incremental  revenues  from  businesses  acquired  over  the  previous  two  years  as  well  as  organic  growth  in  the 
Electronics and Automotive segments, partially offset by lower sales from the Industrial segment due to weaker end markets. 
The Company also experienced $7.3 million in unfavorable foreign currency effects in 2016 compared to 2015 primarily 
resulting from sales denominated in Chinese renminbi. 

The increase in sales in 2016 reflects a $75.2 million, or 22%, increase in Automotive segment sales and a $129.7 million, or 
32%, increase in Electronics segment sales, partially offset by a $16.6 million, or 14%, decrease in Industrial segment sales.  

Gross Profit 

Gross profit was $413.1 million, or 39.1% of sales, in 2016, compared to $330.5 million, or 38.1% of sales, in 2015. Gross 
profit  for  2016  was  negatively  impacted  by  $10.8  million  of  charges  primarily  related  to  the  inventory  step-up  from  the 
acquisition  of  PolySwitch  and  to  a  lesser  extent  the  ON  Portfolio  and  Menber’s  acquisitions.  Gross  profit  for  2015  was 
negatively impacted by $5.2 million of charges related to the transfer of the Company’s reed switch production from the U.S. 
and China to the Philippines.  

Operating Expenses 

Total operating expense was $282.5 million, or 26.7% of net sales, for 2016 compared to $226.3 million, or 26.1% of net 
sales,  for  2015.  Operating  expense  in  2016  included  $39.1  million  of  charges  primarily  consisting  of  acquisition  and 
integration costs of $21.4 million and $14.8 million of charges related to the impairment of the Custom Products reporting 
unit. Operating expense in 2015 included $39.9 million of charges, primarily related to the U.S. pension settlement of $31.9 
million and restructuring and acquisition costs of $8.0 million.  

Operating Income 

Operating income was $130.6 million, or 12.4% of net sales, in 2016 compared to $104.2 million, or 12.0% of net sales, in 
the prior year. The increase in operating income in the current year was due primarily to higher revenue as well as the factors 
affecting operating expenses discussed above. 

Interest  expense  was  $8.6  million  in  2016  compared  to  $4.1  million  in  2015  and  is  primarily  related  to  the  Company’s 
increased borrowing to fund acquisitions.  

Foreign exchange (gain) loss was $0.5 million of loss in 2016 compared to $1.5 million of gain in 2015. The fluctuation in 
foreign exchange was primarily attributable to changes in the value of the euro, Philippine peso and Chinese renminbi against 
the U.S. dollar in 2016 and 2015. 

Other Expense (Income), Net 

Other expense (income), net, consisting of interest income, royalties and non-operating income was $1.7 million of income 
in 2016 compared to $5.4 million of income in 2015. The year-over-year decrease in income primarily reflects lower interest 
income in 2016.  

26 

  
  
      
  
      
  
  
  
    
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
Income Taxes 

Income tax expense was $18.8 million with an effective tax rate of 15.2% in 2016 compared to income tax expense of $26.1 
million with an effective tax rate of 24.4% in 2015. The effective tax rates for these periods are lower than the U.S. statutory 
tax rate primarily due to income earned in lower tax jurisdictions and, with respect to the 2016 period, a one-time deduction 
with respect to the stock of one of the Company’s affiliates partially offset by the impact of the impairment of goodwill for 
which no tax benefit was recorded and taxes on unremitted earnings, and, with respect to the 2015 period, the impact of a 
pension settlement partially offset by the impact from the restructuring of the legal ownership of the Company’s Mexican 
manufacturing operations. 

Segment Information 

The Company reports its operations by the following segments: Electronics, Automotive and Industrial. Segment information 
is described more fully in Note 12, Segment Information, of the Notes to Consolidated Financial Statements included in this 
Annual Report. 

The following table is a summary of the Company’s net sales by segment: 

(in millions) 
Electronics ..........................................................................................   $
Automotive .........................................................................................     
Industrial ............................................................................................     
Total ............................................................................................   $

2016 

2015 

Change 

535.2    $ 
415.2      
105.8      
1,056.2    $ 

405.5    $ 
340.0      
122.4      
867.9    $ 

129.7   
75.2   
(16.6 ) 
188.3   

Fiscal Year 

Electronics Segment 

The  Electronics  segment,  which  accounted  for  approximately  51%  of  total  sales  in  2016,  has  produced  modest  organic 
revenue growth over the last few years. In 2016, sales increased $129.7 million, or 32%, compared to the prior year, reflecting 
$110.0 million of sales from businesses acquired in 2016 as well as organic growth in sensor products and to a lesser extent 
passive and semiconductor products. Operating margins also improved in 2016 compared to 2015 due to better leverage from 
the higher sales, as well as favorable product and regional mix. 

Fourth quarter 2016 sales were unseasonably strong due to higher demand in some markets, along with an earlier than usual 
Chinese New Year. The book-to-bill ratio of 1.05 at the end of the fourth quarter is primarily due to stronger than normal 
seasonal trends. 

Automotive Segment  

The Automotive segment, which accounted for approximately 39% of total sales in 2016, has been the Company’s fastest 
growing business over the last few years. In 2016, sales increased $75.2 million, or 22%, compared to the prior year, reflecting 
$60.2 million of incremental sales from businesses acquired in 2016 and the fourth quarter of 2015 as well as organic growth 
related  to  sensor  and  passenger  car  products.  These  increases  in  sales  were  partially  offset  by  lower  sales  of  legacy 
commercial  vehicle  products,  reflecting  weakness  in  the  North  American  heavy  truck,  construction,  and  agricultural  end 
markets.  

The segment realized growth in fuse content which was driven by more sophisticated electronics in vehicles and sales of 
high-current products, especially the Masterfuse® line. Also contributing to segment performance was the automotive sensor 
business which experienced strong growth in sales and a significant improvement in margins. Sales in China were strong due 
to the Chinese government’s tax incentives for smaller cars driving higher growth in the China car industry.  

Industrial Segment  

The Industrial segment, which accounted for approximately 10% of total sales in 2016, experienced a sales decrease of 14% 
over the prior year with declines across all businesses. The Company also divested certain non-core product lines during 
2016. See Note 2, Acquisitions and Dispositions of the Notes to the Consolidated Financial Statements included in this Annual 
Report, for additional information. The Company’s power fuse business has benefited from a strong U.S. solar market in 
recent years; however, this market slowed in the second half of 2016. Sales in the protection relay business continued to be 

27 

  
  
  
  
  
  
  
      
  
  
  
    
    
  
  
  
  
  
  
  
  
  
impacted  by  weakness  in  the  heavy  industrial  and  oil  and  gas  markets,  as  those  customers  have  restricted  their  capital 
spending. In the custom products business, the Company continued to see a decline in the potash market, which has resulted 
in  the  aforementioned  impairment  charge  in  the  third  quarter  of  2016.  It  is  possible  that  the  Company  could  recognize 
impairment charges for the Relays reporting unit if there are declines in profitability or projected future operating results due 
to changes in volume, market pricing, cost, or the business environment. 

Geographic Sales Information 

Sales by geography represent sales to customer or distributor locations. The following table is a summary of the Company’s 
net sales by geography: 

(in millions) 
Americas ............................................................................................   $
Europe ................................................................................................     
Asia-Pacific ........................................................................................     
Total ............................................................................................   $

2016 

2015 

Change 

411.1    $ 
200.3      
444.8      
1,056.2    $ 

401.2    $ 
152.7      
314.0      
867.9    $ 

9.9   
47.6   
130.8   
188.3   

Fiscal Year 

Americas  

Sales in the Americas increased $9.9 million, or 2%, in 2016 compared to 2015, primarily due to acquisitions and increased 
demand for Electronics products, partially offset by lower Industrial sales. Electronics sales increased $23.3 million, or 20%, 
primarily  due  to  acquisitions  as  well  as  increased sales  for  passive  and sensor products.  Industrial  sales  decreased $14.0 
million, or 13%, resulting from decreases in demand for power fuses, custom products, and relay products.  

Europe  

European  sales  increased  $47.6  million,  or  31%,  in  2016  compared  to  2015  primarily  due  to  acquisitions  and  increased 
demand for Automotive and Electronics products, partially offset by lower Industrial sales. Automotive sales increased $26.8 
million, or 27%, in 2016 primarily due to acquisitions and increased sales for sensor products. Electronics sales increased 
$22.4 million, or 46%, primarily due to acquisitions as well as increased sales for the passive and sensor products. Industrial 
sales decreased $1.5 million, or 24%, in 2016 primarily from lower sales of fuse and relay products.  

Asia-Pacific  

Asia-Pacific sales increased $130.8 million, or 42%, in 2016 compared to 2015, primarily due to acquisitions and increased 
demand for Automotive and Electronics products offset by lower Industrial sales and changes in foreign exchange rates of 
$5.4 million. Electronics sales increased $84.0 million, or 35%, primarily due to acquisitions as well as increased sales for 
passive  and  sensor  products  partially  offset  by  $2.3  million  due  to  changes  in  foreign  exchange  rates.  Automotive  sales 
increased $47.8 million, or 72%, primarily due to acquisitions as well as increased sales for passenger car and sensor products, 
partially offset by $3.3 million of changes in foreign exchange rates. Industrial sales decreased $1.2 million, or 13%. 

Liquidity and Capital Resources 

Cash  and  cash  equivalents  were  $429.7  million  as  of  December  30, 2017,  an  increase  of $154.6  million  as  compared  to 
December 31, 2016. 

As of December 30, 2017, $309.5 million of the $429.7 million of the Company’s cash and cash equivalents was held by 
non-U.S. subsidiaries. Of the $309.5 million, at least $160 million can be repatriated with minimal tax consequences. With 
respect to the remaining $149.5 million, the Company has recognized deferred tax liabilities of $12.0 million as of December 
30, 2017 (including $11.8 million for non-U.S. taxes and $0.2 million for U.S. state taxes) on approximately $118 million of 
the non-U.S. cash balance because the amounts are not considered to be permanently reinvested. In addition, repatriation of 
some non-U.S. cash balances is further restricted by local laws. Management regularly evaluates whether non-U.S. earnings 
are expected to be permanently reinvested. This evaluation requires judgment about the future operating and liquidity needs 
of the Company and its non-U.S. subsidiaries. Changes in economic and business conditions, tax laws, or the Company’s 
financial situation could result in changes to these judgments and the need to record additional tax liabilities. 

28 

  
  
  
  
  
      
  
  
  
    
    
  
  
  
  
  
   
  
  
  
  
  
The Company has historically supported its liquidity needs through cash flows from operations. Management expects that 
the Company’s (i) current level of cash, cash equivalents, and marketable securities, (ii) current and forecasted cash flows 
from operations, (iii) availability under existing funding arrangements, and (iv) access to capital in the capital markets will 
provide sufficient funds to support the Company’s operations, capital expenditures, investments, and debt obligations on both 
a short-term and long-term basis.  

Revolving Credit Facility/Term Loan 

On March 4, 2016, the Company entered into a five-year credit agreement (“Credit Agreement”) with a group of lenders for 
up to $700.0 million. The Credit Agreement consisted of an unsecured revolving credit facility (“Revolving Credit Facility”) 
of $575.0 million and an unsecured term loan credit facility (“Term Loan”) of up to $125.0 million. In addition, the Company 
had  the  ability,  from  time  to  time,  to  increase  the  size  of  the  Revolving  Credit  Facility  and  the  Term  Loan  by  up  to  an 
additional $150.0 million, in the aggregate, in each case in minimum increments of $25.0 million, subject to certain conditions 
and  the  agreement  of  participating  lenders.  For  the  Term  Loan,  the  Company  was  required  to  make  quarterly  principal 
payments of $1.6 million through March 31, 2018 and $3.1 million from June 30, 2018 through December 31, 2020 with the 
remaining balance due on March 4, 2021. 

On October 13, 2017, the Company amended the Credit Agreement to increase the Revolving Credit Facility from $575.0 
million to $700.0 million and increase the Term Loan from $125.0 million to $200.0 million and to extend the expiration 
date from March 4, 2021 to October 13, 2022. The Credit Agreement also includes the option for the Company to increase 
the size of the Revolving Credit Facility and the Term Loan by up to an additional $300.0 million, in the aggregate, subject 
to the satisfaction of certain conditions set forth in the Credit Agreement. Term Loans may be made in up to two advances. 
The first advance of $125.0 million occurred on October 13, 2017 and the second advance of $75.0 million occurred on 
January 16, 2018. For the Term Loan, the Company is required to make quarterly principal payments of 1.25% of the original 
term loan ($1.6 million as of December 30, 2017 increasing to $2.5 million with the second advance on January 16, 2018) 
through maturity, with the remaining balance due on October 13, 2022  

Outstanding  borrowings  under  the  Credit  Agreement  bear  interest,  at  the  Company’s  option,  at  either  LIBOR,  fixed  for 
interest periods of one, two, three or six-month periods, plus 1.00% to 2.00%, or at the bank’s Base Rate, as defined, plus 
0.00% to 1.00%, based upon the Company’s Consolidated Leverage Ratio, as defined. The Company is also required to pay 
commitment  fees  on  unused  portions  of  the  credit  agreement  ranging  from  0.15%  to  0.25%,  based  on  the  Consolidated 
Leverage Ratio, as defined. The credit agreement includes representations, covenants and events of default that are customary 
for financing transactions of this nature. The effective interest rate on outstanding borrowings under the credit facility was 
3.07% at December 30, 2017. 

Senior Notes 

On December 8, 2016, the Company entered into a Note Purchase Agreement, pursuant to which the Company issued and 
sold €212 million aggregate principal amount of senior notes in two series. The funding date for the Euro denominated senior 
notes occurred on December 8, 2016 for €117 million in aggregate amount of 1.14% Senior Notes, Series A, due December 
8, 2023 (“Euro Senior Notes, Series A due 2023”), and €95 million in aggregate amount of 1.83% Senior Notes, Series B 
due December 8, 2028 (“Euro Senior Notes, Series B due 2028”) (together, the “Euro Senior Notes”). Interest on the Euro 
Senior Notes is payable semiannually on June 8 and December 8, commencing June 8, 2017. 

On December 8, 2016, the Company entered into a Note Purchase Agreement, pursuant to which the Company issued and 
sold $125 million aggregate principal amount of senior notes in two series. On February 15, 2017, $25 million in aggregate 
principal amount of 3.03% Senior Notes, Series A, due February 15, 2022 (“U.S. Senior Notes, Series A due 2022”), and 
$100 million in aggregate principal amount of 3.74% Senior Notes, Series B, due February 15, 2027 (“U.S. Senior Notes, 
Series B due 2027”) (together, the “U.S. Senior Notes due 2022 and 2027”) were funded. Interest on the U.S. Senior Notes 
due 2022 and 2027 is payable semiannually on February 15 and August 15, commencing August 15, 2017. 

On November 15, 2017, the Company entered into a Note Purchase Agreement pursuant to which the Company issued and 
sold $175 million in aggregate principal amount of senior notes in two series. On January 16, 2018, $50 million aggregate 
principal amount of 3.48% Senior Notes, Series A, due February 15, 2025 (“U.S. Senior Notes, Series A due 2025”) and 
$125 million in aggregate principal amount of 3.78% Senior Notes, Series B, due February 15, 2030 (“U.S. Senior Notes, 
Series A due 2030”) (together the “U.S. Senior Notes due 2025 and 2030” and with the Euro Senior Notes and the U.S. Senior 
Notes 2022 and 2027, the “Senior Notes”) were funded. Interest on the U.S. Senior Notes due 2025 and 2030 will be payable 
on February 15 and August 15, commencing on August 15, 2018. 

29 

  
  
  
  
   
  
  
  
  
The Company was in compliance with its debt covenants as of December 30, 2017, and expects to remain in compliance 
based on management’s estimates of operating and financial results for 2017 and the foreseeable future. As of December 30, 
2017,  the  Company  met  all  the  conditions  required  to  borrow  under  the  Credit  Agreement  and  management  expects  the 
Company to continue to meet the applicable borrowing conditions. 

Acquisitions 

During the year ended December 30, 2017, the Company paid $38.5 million, net of cash acquired, for the acquisitions of U.S 
Sensor and Monolith. The Company financed the cash portion of the acquisition with a combination of cash on hand and 
borrowings under the credit facility. 

During the year ended December 31, 2016, the Company paid $417.1 million of total purchase prices, net of cash acquired, 
for  the  acquisitions  of  the  ON  Portfolio,  Menber’s  and  PolySwitch.  The  Company  financed  the  cash  portion  of  these 
acquisitions with a combination of cash on hand and borrowings under the credit facility. 

During  the  year  ended  January  2,  2016,  the  Company  paid  $4.6  million,  net  of  cash  acquired,  substantially  all  for  the 
acquisition of Sigmar. The Company financed the cash portion of the acquisition with cash on hand. 

Cash Flow Overview 

Operating  cash  inflows  are  largely  attributable  to  sales  of  the  Company’s  products.  Operating  cash  outflows  are  largely 
attributable to recurring expenditures for raw materials, labor, rent, interest, taxes and other operating activities. 

The following describes the Company’s cash flows for the twelve months ended December 30, 2017 and December 31, 2016 

(in millions) 
Net cash provided by operating activities ........................................................................   $
Net cash provided used in investing activities  ................................................................     
Net cash (used in) provided by financing activities .........................................................     
Effect of exchange rate changes on cash and cash equivalents ........................................     
Increase (decrease) in cash and cash equivalents ......................................................     
Cash and cash equivalents at beginning of period ............................................................     
Cash and cash equivalents at end of period ...............................................................   $

Fiscal Year 

2017 

2016 

269.2     $
(96.1 )     
(24.7 )     
6.2       
154.6       
275.1       
429.7     $

180.1  
(511.2) 
284.2  
(6.8) 
(53.7) 
328.8  
275.1  

Cash flows from Operating Activities 

Net cash provided by operating activities was $269.2 million for 2017, compared to $180.1 million during 2016. The increase 
in net cash provided by operating activities was primarily driven by higher earnings, lower cash taxes, reduced acquisition 
and integration payments and the timing of supplier and customer payments.  

Cash flows from Investing Activities 

Net cash used in investing activities was $96.1 million for 2017, compared to $511.2 million during 2016. Net cash used for 
acquisitions of $38.5 million in 2017 related to the acquisition of a majority stake in Monolith for $14.2 million and the 
acquisition of U.S. Sensor for $24.3 million. Net cash used for acquisitions of $471.1 million for 2016 primarily related to 
the  acquisitions  of  PolySwitch  for  $344.5  million,  the  ON  Portfolio  for  $104.0  million  and  Menber’s  for  $19.2  million. 
Capital expenditures were $65.9 million, representing an increase of $19.7 million compared to 2016. 

Cash flows from Financing Activities 

Net cash used in financing activities was $24.6 million for 2017 compared to net cash provided by financing activities of 
$284.2 million for 2016. The Company had $149.4 million of proceeds from the credit facility and senior notes payable and 
$134.7 million of payments on the term loan and credit facility in 2017 as compared to $718.4 million of proceeds from the 
credit facility and term loan and $421.2 million of payments on the term loan and credit facility. Additionally, dividends paid 
increased $3.8 million from $27.9 million in 2016 to $31.7 million for 2017.  

30 

  
  
  
  
  
  
  
  
  
  
  
  
    
  
  
  
   
  
  
  
  
 
 
The following describes the Company’s cash flows for the twelve months ended December 31, 2016 and January 2, 2016 

(in millions) 
Net cash provided by operating activities ........................................................................   $
Net cash used in investing activities  ................................................................................     
Net cash used in financing activities ................................................................................     
Effect of exchange rate changes on cash and cash equivalents ........................................     
Increase (decrease) in cash and cash equivalents ......................................................     
Cash and cash equivalents at beginning of period ............................................................     
Cash and cash equivalents at end of period ...............................................................   $

Fiscal Year 

2016 

2015 

180.1     $
(511.2 )     
284.2       
(6.8 )     
(53.7 )     
328.8       
275.1     $

165.8  
(44.2) 
(67.6) 
(22.8) 
31.2  
297.6  
328.8  

Cash flows from Operating Activities 

Net cash provided by operating activities increased $14.3 million in 2016 compared to 2015. Cash provided by operating 
activities in 2016 included $104.5 million in net income, $83.0 million in non-cash adjustments (primarily $53.1 million in 
depreciation and amortization) and $7.4 million of unfavorable changes in operating assets and liabilities. 

Changes in operating assets and liabilities (including short-term and long-term items) that negatively impacted cash flows in 
2016 consisted of changes in accounts receivable ($25.2 million), accrued taxes ($18.1 million) and prepaid expenses and 
other ($0.3 million). The increase in accounts receivable reflects increased sales in 2016 compared to the prior year. Positively 
impacting cash flows were changes in inventory ($8.5 million), accrued expenses including post-retirement ($2.3 million), 
accounts payable ($19.2 million) and accrued payroll and severance ($6.1 million). 

Cash flows from Investing Activities 

Net cash used in investing activities increased $467.1 million in 2016 compared to 2015 primarily due to the acquisitions of 
PolySwitch ($344.5 million, net of cash acquired), the ON portfolio business ($104.0 million), and Menber’s ($19.2 million). 

Cash flows from Financing Activities 

Net cash provided by financing activities increased $351.9 million in 2016 compared to 2015. The increase was primarily 
due to an increase in net proceeds from debt of $314.8 million in 2016 compared to 2015. In March the company replaced 
its credit agreement with a new agreement and in December the company received proceeds from the issuance of senior 
notes. Also contributing to the increase in comparative periods was the use of cash for the share repurchase in 2015 of $31.3 
million.  Information  regarding  the  company’s  debt  is  provided  in  Note  6,  Debt,  of  the  Notes  to  Consolidated  Financial 
Statements included in this Annual Report. 

Capital Resources 

The Company expends capital to support its operating and strategic plans. Such expenditures include strategic acquisitions, 
investments  to  maintain  capital  assets,  develop  new  products  or  improve  existing  products,  and  to  enhance  capacity  or 
productivity. Many of the associated projects have long lead-times and require commitments in advance of actual spending.  

Share Repurchase Program 

The Company’s Board of Directors authorized the repurchase of up to 1,000,000 shares of the Company’s common stock 
under a program for the period May 1, 2017 to April 30, 2018. The Company did not repurchase any shares of its common 
stock during fiscal 2017 and the full 1,000,000 shares may yet be purchased under the program as of December 30, 2017.  

31 

  
  
  
  
  
    
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
Contractual Obligations and Commitments  

The following table summarizes outstanding contractual obligations and commitments as of December 30, 2017: 

(in thousands) 
Long-term debt(a) ..................................................   $
Interest payments(b) ..............................................     
Operating lease payments(c)  .................................     
Income Tax Obligation(d) .....................................     
Purchase obligations(e) ..........................................     
Total ..............................................................   $

Total 
500,492    $ 
85,973      
34,578      
35,400      
27,600      
685,043    $ 

Less than  
1 Year 

1 to 3 
Years 

6,250    $
11,809      
10,842      
3,400      
27,600      
59,901    $

12,500    $
22,697      
11,619      
6,000      
—      
52,816    $

3 to 5 
Years 
128,750    $
20,597      
8,096      
6,000      
—      
163,443    $

Greater  
than  
5 Years 

352,992  
30,870  
5,021  
20,000  
—  
408,883  

(a) Excludes offsetting issuance costs of $4.9 million. Euro denominated debt amounts are converted based on the Euro to
U.S. Dollar spot rate at year end. Excludes funding of $50 million and $125 million from the U.S Senior Notes, Series
A due 2025 and U.S. Senior Notes, Series A due 2030, respectively, as these occurred subsequent to December 30,
2017. For more information see Note 6, Debt, of the Notes to the Consolidated Financial Statements. 

(b) Amounts represent estimated contractual interest payments  on outstanding debt. Rates in effect as of December 30,
2017 are used for variable rate debt. For more information see Note 6, Debt, of the Notes to the Consolidated Financial
Statements.  

   (c) For more information see Note 5, Lease Commitments, of the Notes to the Consolidated Financial Statements. 

(d) The  Income  Tax  Obligation  represents  the  current  federal  and  state  income  tax  expense  for  2017  including  the
preliminary  estimate  of  $49  million  for  the  Toll  Charge,  partially  offset  by  $13  million  of  foreign  tax  credits.  The
Company will elect to pay the 2017 current federal income tax over the eight-year period as prescribed by the Tax Act.
For more information see Note 10, Income Taxes, of the Notes to the Consolidated Financial Statements. 

(e) Purchase  obligations  include  commitments  for  capital  expenditures  not  recognized  in  the  Company’s  Consolidated

Balance Sheets. 

In addition to the above contractual obligations and commitments, the Company had the following obligations at December 
30, 2017: 

The Company has Company-sponsored defined benefit pension plans covering employees at various non-U.S. subsidiaries 
including the U.K., Germany, the Philippines, China, Japan, Mexico, Italy and France. At December 30, 2017, the Company 
had a net unfunded status of $19.1 million. The Company expects to make approximately $1.4 million of contributions to the 
plans in 2018. For additional information, see Note 8, Benefit Plans, of the Notes to the Consolidated Financial Statements. 

The Company has a non-qualified Supplemental Retirement and Savings Plan which provides additional retirement benefits 
for certain management employees and named executive officers by allowing participants to defer a portion of their annual 
compensation. As of December 30, 2017, there was $8.0 million of accrued compensation benefits included in Other long-
term liabilities. For additional information, see Note 8, Benefit Plans, of the Notes to the Consolidated Financial Statements. 

As of December 30, 2017, the Company recognized various accruals related to employee compensation including its annual 
incentive program that are expected to be paid in 2018. 

Due  to  the uncertainty  with respect  to the cash outflows,  the  preceding  table  excludes  unrecognized  tax  benefits  of  $7.7 
million. The Company does not expect to make significant payments of these liabilities within the next year. For additional 
information, see Note 10, Income Taxes, of the Notes to the Consolidated Financial Statements.  

Off-Balance Sheet Arrangements 

As  of  December  30,  2017,  the  Company  did  not  have  any  off-balance  sheet  arrangements,  as  defined  under  SEC  rules. 
Specifically, the Company was not liable for guarantees of indebtedness owed by third parties, the Company was not directly 
liable for the debt of any unconsolidated entity and the Company did not have any retained or contingent interest in assets. 

32 

  
  
  
    
    
    
    
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
The  Company  does  not  participate  in  transactions  that  generate  relationships  with  unconsolidated  entities  or  financial 
partnerships, such as entities often referred to as structured finance or special purpose entities.  

Recent Accounting Pronouncements  

Recently issued accounting standards and their estimated effect on the Company’s Consolidated Financial Statements are 
described in Note 1, Summary of Significant Accounting Policies and Other Information, of the Notes to the Consolidated 
Financial Statements. 

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK. 

The Company is exposed to market risk from changes in interest rates, foreign exchange rates and commodity prices. 

Interest Rates 

The Company had $122.5 million in debt outstanding at December 30, 2017 related to the unsecured revolving credit facility 
and term loan. Because 100% of this debt has variable interest rates, the Company is subject to future interest rate fluctuations 
in relation to these borrowings which could potentially have a negative impact on cash flows of the Company. A prospective 
increase of 100 basis points in the interest rate applicable to the Company’s outstanding borrowings under its credit facility 
would  result  in  an  increase  of  approximately  $1.2  million  in  annual  interest  expense.  The  Company  is  not  party  to  any 
currency exchange or interest rate protection agreements as of December 30, 2017. 

Foreign Exchange Rates 

The majority of the company’s operations consist of manufacturing and sales activities in foreign countries. The company 
has manufacturing facilities in the U.S., Mexico, Canada, China, Italy, Lithuania, Japan and the Philippines. During 2017, 
sales to customers outside the U.S. were approximately 69% of total net sales. During 2016, sales to customers outside the 
U.S. were approximately 66% of total net sales. Substantially all sales in Europe are denominated in euros and substantially 
all  sales  in  the  Asia-Pacific  region  are  denominated  in  U.S.  dollars,  Japanese  yen,  Korean  won,  Chinese  renminbi  or 
Taiwanese dollars. 

The company’s foreign exchange exposures result primarily from inter-company loans, external borrowings, sale of products 
in foreign currencies, foreign currency denominated purchases, employee-related and other costs of running operations in 
foreign countries. The company’s most significant net long exposures are to the Philippine peso and the euro. The company’s 
most significant net short exposures are to the Chinese renminbi, Mexican peso, and Philippine peso. Changes in foreign 
exchange rates could affect the company’s sales, costs, balance sheet values and earnings.  

At December 30, 2017, the net value of the Company’s assets with exposure to foreign currency risk was approximately $298 
million,  with  the  largest  exposure being  U.S.  Dollar  denominated  inter-company  loans  with  a  Philippine peso functional 
currency  subsidiary.  The  reduction  in  earnings  from  a  hypothetical  instantaneous  10%  adverse  change  in  quoted  foreign 
currency spot rates applied to foreign currency sensitive asset instruments would be $30 million at December 30, 2017. At 
December 30, 2017, the net value of the Company’s liabilities with exposure to foreign currency risk was $204 million, with 
the largest exposure being U.S. Dollar denominated inter-company loans with a euro functional currency subsidiary. The 
reduction in earnings from a hypothetical instantaneous 10% adverse change in quoted foreign currency spot rates applied to 
foreign  currency  sensitive  liability  instruments  would  be  $20  million  at  December  30,  2017.  As  a  result  of  the  mix  in 
currencies impacting the hypothetical 10% changes, the movements in some instruments would offset movements in other 
instruments reducing the hypothetical exposure to the Company.  

Commodity Prices 

The Company uses various metals in the manufacturing of its products, including copper, zinc, tin, gold, and silver. Prices of 
these commodities can and do fluctuate significantly, which can impact the Company’s earnings. The most significant of 
these exposures is to copper, zinc, gold, and silver, where at current prices and volumes, a 10% price change would affect 
annual pre-tax profit by approximately $3.9 million for copper, $1.5 million for zinc, $0.2 million for gold, $0.8 million for 
silver, and $0.6 million for tin.  

The cost of oil has fluctuated dramatically over the past several years. Consequently, there is a risk that a return to high prices 
for oil and electricity in 2018 could have a significant impact on the Company’s transportation and utility expenses. 

33 

  
  
  
  
  
  
   
  
  
  
  
  
  
  
While the Company is exposed to significant changes in certain commodity prices and foreign currency exchange rates, the 
Company actively monitors these exposures and may take various actions from time to time to mitigate any negative impacts 
of these exposures. 

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA. 

Index 

Page 

Report of Independent Registered Public Accounting Firm – Consolidated Financial Statements .............................. 
Report of Independent Registered Public Accounting Firm – Internal Control Over Financial Reporting ................... 
Consolidated Financial Statements 

Consolidated Balance Sheets ............................................................................................................................. 
Consolidated Statements of Net Income ........................................................................................................... 
Consolidated Statements of Comprehensive Income ........................................................................................ 
Consolidated Statements of Cash Flows ........................................................................................................... 
Consolidated Statements of Equity ................................................................................................................... 

Notes to Consolidated Financial Statements 

1. Summary of Significant Accounting Policies and Other Information ........................................................... 
2. Acquisitions and Divestitures ........................................................................................................................ 
3. Inventories ..................................................................................................................................................... 
4. Goodwill and Other Intangible Assets ........................................................................................................... 
5. Lease Commitments ...................................................................................................................................... 
6. Debt ............................................................................................................................................................... 
7. Fair Value of Assets and Liabilities .............................................................................................................. 
8. Benefit Plans ................................................................................................................................................. 
9. Shareholders’ Equity ..................................................................................................................................... 
10. Income Taxes .............................................................................................................................................. 
11. Earnings Per Share ...................................................................................................................................... 
12. Segment Information ................................................................................................................................... 
13. Selected Quarterly Financial Data (Unaudited) ........................................................................................... 

35 
36 

37 
38 
38 
39 
40 

41 
48 
54 
54 
56 
56 
59 
60 
65 
66 
70 
70 
73 

34 

   
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM 

Board of Directors and Shareholders 

Littelfuse, Inc. 

Opinion on the financial statements  
We have audited the accompanying consolidated balance sheets of Littelfuse, Inc. (a Delaware corporation) and subsidiaries 
(the  “Company”)  as  of  December  30,  2017  and  December  31,  2016,  the  related  consolidated  statements  of  net  income, 
comprehensive income, equity, and cash flows for each of the three years in the period ended December 30, 2017, and the 
related notes and schedule (collectively referred to as the “financial statements”). In our opinion, the financial statements 
present fairly, in all material respects, the financial position of the Company as of December 30, 2017 and December 31, 
2016, and the results of its operations and its cash flows for each of the three years in the period ended December 30, 2017, 
in conformity with accounting principles generally accepted in the United States of America.  

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) 
(“PCAOB”), the Company’s internal control over financial reporting as of December 30, 2017, based on criteria established 
in the 2013 Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway 
Commission  (“COSO”),  and  our  report  dated  February  23,  2018,  expressed  an  unqualified  opinion  on  those  financial 
statements. 

Basis for opinion  
These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion 
on the Company’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and 
are  required  to  be  independent  with  respect  to  the  Company  in  accordance  with  the  U.S.  federal  securities  laws  and  the 
applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.  

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform 
the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether 
due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial 
statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included 
examining,  on  a  test  basis,  evidence  supporting  the  amounts  and  disclosures  in  the  financial  statements.  Our  audits  also 
included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the 
overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.  

/s/ GRANT THORNTON LLP 

We have served as the Company’s auditor since 2014.  

Chicago, Illinois 
February 23, 2018 

35 

  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM 

Board of Directors and Shareholders 

Littelfuse, Inc. 

Opinion on internal control over financial reporting 
We have audited the internal control over financial reporting of Littelfuse, Inc. (a Delaware corporation) and subsidiaries (the 
“Company”) as of December 30, 2017, based on criteria established in the 2013 Internal Control—Integrated Framework 
issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Company 
maintained, in all material respects, effective internal control over financial reporting as of December 30, 2017, based on 
criteria established in the 2013 Internal Control—Integrated Framework issued by COSO. 

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) 
(“PCAOB”), the consolidated financial statements of the Company as of and for the year ended December 30, 2017, and our 
report dated February 23, 2018 expressed an unqualified opinion on those financial statements. 

Basis for opinion 
The  Company’s  management  is  responsible  for  maintaining  effective  internal  control over  financial  reporting  and for  its 
assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s 
Report on Internal Control over Financial Reporting (“Management’s Report”). Our responsibility is to express an opinion 
on the Company’s internal control over financial reporting based on our audit. 

We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company 
in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange 
Commission and the PCAOB. 

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform 
the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in 
all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the 
risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based 
on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that 
our audit provides a reasonable basis for our opinion. 

Definition and limitations of internal control over financial reporting 
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the 
reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally 
accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures 
that  (1) pertain  to  the  maintenance  of  records  that,  in reasonable detail,  accurately  and  fairly  reflect  the  transactions  and 
dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to 
permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and 
expenditures of the company are being made only in accordance with authorizations of management and directors of the 
company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or 
disposition of the company’s assets that could have a material effect on the financial statements. 

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, 
projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate 
because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. 

/s/ GRANT THORNTON LLP 

Chicago, Illinois 
February 23, 2018 

36 

  
  
  
  
  
  
  
  
  
  
  
  
  
  
   
CONSOLIDATED BALANCE SHEETS 

December 30, 
2017 

December 31, 
2016 

(in thousands) 
ASSETS 
Current assets: 

Cash and cash equivalents ...........................................................................................   $
Short-term investments ................................................................................................     
Trade receivables, less allowances (2017 - $27,516; 2016 - $25,874) ........................     
Inventories ...................................................................................................................     
Prepaid income taxes and income taxes receivable .....................................................     
Prepaid expenses and other current assets ...................................................................     
Total current assets ..........................................................................................................     
Property, plant, and equipment: 

Land .............................................................................................................................     
Buildings ......................................................................................................................     
Equipment ....................................................................................................................     
Accumulated depreciation and amortization ................................................................     
Net property, plant, and equipment .................................................................................     
Intangible assets, net of amortization ..............................................................................     
Goodwill ..........................................................................................................................     
Investments .....................................................................................................................     
Deferred income taxes .....................................................................................................     
Other assets .....................................................................................................................     
Total assets ......................................................................................................................   $
LIABILITIES AND EQUITY 
Current liabilities: 

Accounts payable .........................................................................................................   $
Accrued payroll ...........................................................................................................     
Accrued expenses ........................................................................................................     
Accrued severance .......................................................................................................     
Accrued income taxes ..................................................................................................     
Current portion of long-term debt ................................................................................     
Total current liabilities ....................................................................................................     
Long-term debt, less current portion ...............................................................................     
Deferred income taxes .....................................................................................................     
Accrued post-retirement benefits ....................................................................................     
Other long-term liabilities ...............................................................................................     
Shareholders’ equity: 

Common stock, par value $0.01 per share: 34,000,000 shares authorized; shares 

issued, 2017 –22,713,198; 2016 –22,626,922 ..........................................................     
Treasury stock, at cost: 439,598 and 409,115 shares, respectively ..............................     
Additional paid-in capital  ...........................................................................................     
Accumulated other comprehensive income  ................................................................     
Retained earnings .........................................................................................................     
Littelfuse, Inc. shareholders’ equity ................................................................................     
Non-controlling interest ..................................................................................................     
Total equity .....................................................................................................................     
Total liabilities and equity ...............................................................................................   $

See accompanying Notes to Consolidated Financial Statements. 

429,676     $ 
35       
182,699       
140,789       
1,689       
37,452       
792,340       

9,547       
86,599       
505,838       
(351,407 )     
250,577       
203,850       
453,414       
10,993       
11,858       
17,070       
1,740,102     $ 

101,844     $ 
49,962       
48,994       
1,459       
16,285       
6,250       
224,794       
489,361       
17,069       
18,742       
62,580       

275,124  
3,690  
176,032  
114,063  
11,671  
31,501  
612,081  

9,268  
80,553  
439,542  
(312,188) 
217,175  
213,027  
403,544  
13,933  
20,585  
10,849  
1,491,194  

90,712  
42,810  
36,138  
2,785  
8,846  
6,250  
187,541  
447,892  
7,066  
13,398  
20,366  

229       
(41,294 )     
310,012       
(63,668 )     
722,140       
927,419       
137       
927,556       
1,740,102     $ 

228  
(36,510) 
291,258  
(74,579) 
634,391  
814,788  
143  
814,931  
1,491,194  

37 

  
  
    
  
      
        
  
      
        
  
      
        
  
      
        
  
      
        
  
      
        
  
  
   
  
 
 
CONSOLIDATED STATEMENTS OF NET INCOME 

(in thousands, except per share data) 

December 30,  
2017 

Year Ended 
December 31,  
2016 

January 2, 
2016 

Net sales .............................................................................................   $ 
Cost of sales .......................................................................................     
Gross profit .........................................................................................     

1,221,534    $
715,001      
506,533      

1,056,159     $
643,042       
413,117       

Selling, general, and administrative expenses ....................................     
Research and development expenses ..................................................     
Pension settlement expenses ..............................................................     
Amortization of intangibles  ...............................................................     
Impairment of goodwill and intangible assets ....................................     
Total operating expenses ....................................................................     
Operating income ...............................................................................     

Interest expense ..................................................................................     
Foreign exchange loss (gain) ..............................................................     
Other (income) expense, net ...............................................................     
Income before income taxes ...............................................................     
Income taxes .......................................................................................     
Net income .........................................................................................   $ 

212,833      
50,489      
—      
24,700      
—      
288,022      
218,511      

13,380      
2,376      
(1,282)     
204,037      
84,518      
119,519    $

206,129       
42,198       
—       
19,337       
14,809       
282,473       
130,644       

8,628       
472       
(1,730 )     
123,274       
18,786       
104,488     $

867,864  
537,365  
330,499  

153,714  
30,802  
29,928  
11,898  
—  
226,342  
104,157  

4,091  
(1,465) 
(5,417) 
106,948  
26,082  
80,866  

Income per share: 

Basic ...............................................................................................   $ 
Diluted ............................................................................................   $ 

5.27    $
5.21    $

4.63     $
4.60     $

3.58  
3.56  

Weighted-average shares and equivalent shares outstanding: 

Basic ...............................................................................................     
Diluted ............................................................................................     

22,687      
22,931      

22,559       
22,727       

22,565  
22,719  

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME 

(in thousands) 

December 30, 
2017 

Year Ended 
December 31,  
2016 

January 2,  
2016 

Net income .........................................................................................   $ 
Other comprehensive income (loss): 

Pension and postemployment liability adjustments net of tax 

119,519    $ 

104,488     $

80,866  

expense (benefit) of $535, ($1,302) and ($106), respectively .....     

1,235      

(3,673 )     

(1,761) 

Pension and postemployment reclassification adjustments net of 

tax (benefit) expense of ($150), $0 and $746, respectively .........     
Unrealized (loss) gain on investments  ...........................................     
Reclassification of pension settlement costs to expense net of tax 

(88)     
(974)     

expense of $11,742 in 2015 .........................................................     
Foreign currency translation adjustments  ......................................     
Comprehensive income ......................................................................   $ 

—      
10,738      
130,430    $ 

412       
(815 )     

—       
(24,832 )     
75,580     $

1,530  
793  

21,124  
(46,231) 
56,321  

See accompanying Notes to Consolidated Financial Statements. 

38 

  
  
  
  
  
    
    
  
  
      
        
        
  
  
      
        
        
  
  
      
        
        
  
  
      
        
        
  
      
        
        
  
  
      
        
        
  
      
        
        
  
  
  
  
  
  
  
  
    
    
  
  
      
        
        
  
      
        
        
  
  
   
 
 
CONSOLIDATED STATEMENTS OF CASH FLOWS 

December 30, 
2017 

Year Ended 
December 31,  
2016 

January 2, 
2016 

(in thousands) 
OPERATING ACTIVITIES 
Net income .........................................................................................   $ 
Adjustments to reconcile net income to net cash provided by 

operating activities: 
Depreciation ....................................................................................     
Amortization of intangibles ............................................................     
Impairment of goodwill and intangible assets ................................     
Provision for bad debts ...................................................................     
Non-cash inventory charges  ...........................................................     
Net loss on pension settlement, net of tax .......................................     
Loss on sale of product line ............................................................     
Loss on sale of property, plant, and equipment  .............................     
Stock-based compensation ..............................................................     
Excess tax benefit on share-based compensation............................     
Deferred income taxes ....................................................................     

Changes in operating assets and liabilities: 

Accounts receivable  .......................................................................     
Inventories ......................................................................................     
Accounts payable ............................................................................     
Accrued expenses (including post-retirement) ...............................     
Accrued payroll and severance .......................................................     
Accrued taxes .................................................................................     
Prepaid expenses and other .............................................................     
Net cash provided by operating activities ...........................................     

INVESTING ACTIVITIES 
Acquisitions of businesses, net of cash acquired ................................     
Purchase of cost method investment ..................................................     
Proceeds from maturities of short-term investments ..........................     
Decrease in entrusted loan ..................................................................     
Purchases of property, plant, and equipment ......................................     
Proceeds from sale of property, plant, and equipment .......................     
Net cash used in investing activities ...................................................     

FINANCING ACTIVITIES 
Proceeds of revolving credit facility ...................................................     
Proceeds of term loan .........................................................................     
Proceeds of senior notes payable ........................................................     
Payments of term loan ........................................................................     
Payments of revolving credit facility .................................................     
Net (payments) proceeds related to stock-based award activities ......     
Proceeds (payments) from entrusted loan ..........................................     
Debt issuance costs .............................................................................     
Cash dividends paid  ..........................................................................     
Excess tax benefit on share-based compensation ...............................     
Purchases of common stock ...............................................................     
Net cash (used in) provided by financing activities ............................     
Effect of exchange rate changes on cash and cash equivalents ..........     
Increase (decrease) in cash and cash equivalents ...............................     
Cash and cash equivalents at beginning of year .................................     
Cash and cash equivalents at end of year ...........................................   $ 

See accompanying Notes to Consolidated Financial Statements. 

39 

119,519    $ 

104,488     $

80,866  

38,311      
24,700      
—      
2,414      
1,607      
—      
—      
3,634      
16,315      
—      
17,063      

(11,087)     
(20,180)     
6,494      
7,641      
3,709      
39,276      
19,754      
269,170      

(38,512)     
—      
3,739      
3,599      
(65,925)     
962      
(96,137)     

15,000      
9,375      
125,000      
(7,188)     
(127,500)     
(2,373)     
(3,599)     
(1,626)     
(31,770)     
—      
—      
(24,681)     
6,200      
154,552      
275,124      
429,676    $ 

33,800       
19,337       
14,809       
1,769       
7,834       
—       
1,391       
813       
11,987       
(3,421 )     
(5,269 )     

(22,779 )     
8,539       
19,190       
2,287       
6,131       
(18,062 )     
(2,711 )     
180,133       

(471,118 )     
—       
345       
5,510       
(46,228 )     
248       
(511,243 )     

367,000       
125,000       
226,428       
(89,688 )     
(331,500 )     
20,494       
(5,510 )     
(3,583 )     
(27,866 )     
3,421       
—       
284,196       
(6,748 )     
(53,662 )     
328,786       
275,124     $

29,701  
11,898  
—  
164  
—  
19,308  
—  
1,253  
10,266  
(1,891) 
11,479  

(3,397) 
(3,577) 
2,573  
6,482  
5,883  
557  
(5,739) 
165,826  

(4,558) 
(3,500) 
—  
7,811  
(44,019) 
102  
(44,164) 

49,000  
—  
—  
(8,750) 
(55,500) 
9,150  
(7,811) 
(42) 
(24,341) 
1,891  
(31,252) 
(67,655) 
(22,792) 
31,215  
297,571  
328,786  

  
  
  
  
  
    
    
  
      
        
        
  
      
        
        
  
      
        
        
  
  
      
        
        
  
      
        
        
  
  
      
        
        
  
      
        
        
  
  
CONSOLIDATED STATEMENTS OF EQUITY 

Littelfuse, Inc. Shareholders’ Equity 

Addl. 
Paid in 
Capital      

Treasury 
Stock 

Accum. 
Other 
Comp. 
Inc. 
(Loss)      

Retained 
Earnings     

Non-
controlling 
Interest 

Common 
Stock 

(in thousands) 
Balance at December 27, 2014 .............................   $ 
Comprehensive income: 

Net income for the year ....................................     
Pension liability adjustments, net .....................     
Pension settlement, net .....................................     
Pension and postemployment reclassification 

adjustments, net ............................................     
Unrealized gain on investments .......................     
Foreign currency translation adjustments  ........     
Comprehensive income ....................................     
Stock-based compensation ...................................     
Withheld 28,286 shares on restricted share units 

for withholding taxes........................................     
Retirement of 214,609 shares of treasury stock ...     
Purchase of 350K shares of common stock ..........     
Stock options exercised, including tax impact of 

($2,485)  ...........................................................     
Cash dividends paid ($1.08 per share)  ................     
Balance at January 2, 2016 ...................................   $ 
Comprehensive income: 
Net income for the year ........................................     

Pension and postemployment liability 

226    $  243,844    $  (18,724)   $  (21,126)   $  519,956    $ 

—      
—      
—      

—      
—      
—      

—      
—      
—      

—      
—      
—      

—      
—      
(1,761)     
—       21,124      

—       80,866      
—      
—      

1,530      
—      
—      
793      
—       (46,231)     

—      
—      
—      

—      

7,782      

—      

—      

—      

—      
—      
(4)     

—      
—      
(1,221)     

(2,727)     
18,712      
(30,027)     

—      
—      
—       (18,712)     
—      
—      

     Total 
143    $ 724,319  

—       80,866  
—      
(1,761)
—       21,124  

1,530  
—      
—      
793  
—       (46,231)
        56,321  
7,782  

—      

(2,727)
—      
—  
—      
—       (31,252)

—      
—      
—      
2      
—      
—       (24,341)     
—      
224    $  243,844    $  (32,766)   $  (45,671)   $  557,769    $ 

9,148      
—      

—      
9,150  
—       (24,341)
143    $ 739,252  

—      

—      

—      

—       104,488      

—       104,488  

adjustments, net ............................................     

—      

—      

—      

(3,673)     

—      

—      

(3,673)

Pension and postemployment reclassification 

adjustments, net ............................................     
Unrealized (loss) on investments .....................     
Foreign currency translation adjustments .........     
Comprehensive income ....................................     
Stock-based compensation ...................................     
Withheld 31,040 shares on restricted share units 

—      
—      
—      

—      
—      
—      

412      
—      
—      
(815)     
—       (24,832)     

—      
—      
—      

—      

7,471      

—      

—      

—      

412  
—      
—      
(815)
—       (24,832)
        75,580  
7,471  

—      

for withholding taxes........................................     

—      

—      

(3,744)     

—      

—      

—      

(3,744)

Stock options exercised, including tax impact of 

($7,400)  ...........................................................     
Cash dividends paid ($1.24 per share)  ................     
Balance at December 31, 2016 .............................   $ 
Comprehensive income: 
Net income for the year ........................................     

Pension and postemployment liability 

4       24,234      
—      
—      
—      
—       (27,866)     
—      
—      
—      
228    $  291,258    $  (36,510)   $  (74,579)   $  634,391    $ 

—       24,238  
—       (27,866)
143    $ 814,931  

—      

—      

—      

—       119,519      

—       119,519  

adjustments, net ............................................     

—      

—      

—      

1,235      

—      

—      

1,235  

Pension and postemployment reclassification 

adjustments, net ............................................     
Unrealized gain (loss) on investments ..............     
Foreign currency translation adjustments  ........     
Comprehensive income  ...................................     
Stock-based compensation ...................................     
Non-controlling interest .......................................     
Withheld 30,459 shares on restricted share units 

for withholding taxes........................................     
Stock options exercised ........................................     
Cash dividends paid ($1.40 per share)  ................     
Balance at December 30, 2017 .............................   $ 

—      
—      
—      

—      
—      
—      

(88)     
—      
—      
(974)     
—       10,738      

—       16,315      
—      
—      

—      
—      

—      
—      

—      
—      
—      

—      
—      

—      
—      
(4,784)     
—      
—      
—      
—      
1      
—      
—       (31,770)     
—      
229    $  310,012    $  (41,294)   $  (63,668)   $  722,140    $ 

—      
2,439      
—      

(88)
—      
—      
(974)
—       10,738  
        130,430  
—       16,315  
(6)
(6)     

(4,784)
—      
—      
2,440  
—       (31,770)
137    $ 927,556  

See accompanying Notes to Consolidated Financial Statements. 

40 

  
  
  
      
  
      
  
  
  
    
    
  
       
        
         
        
         
         
        
  
       
       
       
       
       
       
        
         
        
         
         
        
  
       
       
       
       
       
       
        
         
        
         
         
        
  
       
       
       
       
       
  
   
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

1. Summary of Significant Accounting Policies and Other Information 

Nature of Operations  

Littelfuse, Inc. and subsidiaries (the “Company”) is a global leader in circuit protection products with advancing platforms 
in power control and sensor technologies, serving customers in the electronics, automotive, and industrial markets. With a 
diverse and extensive product portfolio of fuses, semiconductors, polymers, ceramics, relays and sensors, the Company works 
with its customers to build safer, more reliable and more efficient products for the connected world in virtually every market 
that  uses  electrical  energy,  ranging  across  consumer  electronics,  IT  and  telecommunication  applications,  industrial 
electronics, automobiles and other transportation, and heavy industrial applications. The Company has a network of global 
engineering centers and labs that develop new products and product enhancements, provides customer application support 
and test products for safety, reliability, and regulatory compliance. 

Fiscal Year  

References herein to “2017”, “fiscal 2017” or “fiscal year 2017” refer to the fiscal year ended December 30, 2017. References 
herein to “2016”, “fiscal 2016” or “fiscal year 2016” refer to the fiscal year ended December 31, 2016. References herein to 
“2015”, “fiscal 2015” or “fiscal year 2015” refer to the fiscal year ended January 2, 2016. The Company operates on a 52-53 
week fiscal year (4-4-5 basis) ending on the Saturday closest to December 31. Therefore, the financial results of certain fiscal 
years and the associated 14 week quarters will not be exactly comparable to the prior and subsequent 52 week fiscal years 
and the associated quarters having only 13 weeks. As a result of using this convention, each of fiscal 2017 and fiscal 2016 
contained 52 weeks whereas fiscal 2015 contained 53 weeks. 

Basis of Presentation  

The  Consolidated  Financial  Statements  include  the  accounts  of  Littelfuse,  Inc.  and  its  subsidiaries.  All  significant 
intercompany  accounts  and  transactions  have  been  eliminated.  The  company’s  Consolidated  Financial  Statements  were 
prepared in accordance with generally accepted accounting principles in the United States of America and include the assets, 
liabilities, sales and expenses of all wholly-owned subsidiaries and majority-owned subsidiaries over which the Company 
exercises control.  

Use of Estimates  

The  process  of  preparing  financial  statements  in  conformity  with  U.S.  generally  accepted  accounting  principles  requires 
management to make estimates and assumptions that affect the amounts of assets and liabilities at the date of the Consolidated 
Financial  Statements,  and  the  reported  amounts  of  revenues  and  expenses  and  the  accompanying  notes.  The  Company 
evaluates and updates its assumptions and estimates on an ongoing basis and may employ outside experts to assist in its 
evaluation, as considered necessary. Actual results could differ from those estimates. 

Cash Equivalents 

All highly liquid investments, with an original maturity of three months or less when purchased, are considered to be cash 
equivalents. 

Short-Term and Long-Term Investments 

As of December 30, 2017, the Company had an investment in Polytronics Technology Corporation Ltd. (“Polytronics”). The 
Company’s Polytronics shares held at the end of fiscal 2017 and 2016 represent approximately 7.2% of total Polytronics 
shares  outstanding.  The  Polytronics  investment  is  classified  as  available-for-sale  and  is  carried  at  fair  value  with  the 
unrealized gains and losses reported as a component of “Accumulated Other Comprehensive Income (Loss).” The fair value 
of  the  Polytronics  investment  was  €9.2  million  (approximately  $11.0  million)  at  December  30,  2017  and  €10.0  million 
(approximately $10.4 million) at December 31, 2016. Included in 2017 and 2016, other comprehensive income are unrealized 
losses of $1.0 million and $0.8 million, respectively, due to changes in fair market value of the Polytronics investment. The 
remaining movement year over year was due to the impact of changes in exchange rates. 

The  Company  has  certain  investment  securities  that  are  classified  as  available-for-sale.  Available-for-sale  securities  are 
carried at fair value with the unrealized gains and losses reported as a component of “Accumulated Other Comprehensive 

41 

 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

Income (Loss).” Realized gains and losses and declines in unrealized value judged to be other-than-temporary on available-
for-sale securities are included in other expense (income), net. The cost of securities sold is based on the specific identification 
method.  Interest  and  dividends  on  securities  classified  as  available-for-sale  are  included  in  interest  income.  Short-term 
investments, which are primarily certificates of deposits, are carried at cost which approximates fair value. 

The  Company  has  investments  related  to  its  non-qualified  Supplemental  Retirement  and  Savings  Plan.  The  Company 
maintains  accounts  for  participants  through  which  participants  make  investment  elections.  The  investment  securities  are 
subject to the claims of the Company’s creditors. The investment securities are all mutual funds with readily determinable 
fair values and are classified as trading securities. The investment securities are measured at fair value with unrealized gains 
and losses recognized in earnings. As of December 30, 2017, there was $8.0 million of marketable securities related to the 
plan included in Other assets on the Consolidated Balance Sheets.  

Trade Receivables 

The Company performs credit evaluations of customers’ financial condition and generally does not require collateral. Credit 
losses are provided for in the financial statements based upon specific knowledge of a customer’s inability to meet its financial 
obligations to the Company. Historically, credit losses have consistently been within management’s expectations and have 
not been a material amount. A receivable is considered past due if payments have not been received within agreed upon 
invoice terms. Write-offs are recorded at the time a customer receivable is deemed uncollectible. 

The  Company  also  maintains  allowances  against  accounts  receivable  for  the  settlement  of  rebates  and  sales  discounts  to 
customers.  These  allowances  are  based  upon  specific  customer  sales  and  sales  discounts  as  well  as  actual  historical 
experience. 

Inventories 

Inventories  are  stated  at  the  lower  of  cost  or  net  realizable  value,  which  approximates  current  replacement  cost.  Cost  is 
principally determined using the first-in, first-out method. The Company maintains excess and obsolete allowances against 
inventory to reduce the carrying value to the expected net realizable value. These allowances are based upon a combination 
of factors including historical sales volume, market conditions, lower of cost or market analysis and expected realizable value 
of the inventory. 

Property, Plant, and Equipment 

Land, buildings, and equipment are carried at cost. Depreciation is calculated using the straight-line method with useful lives 
of 21 years for buildings, seven to nine years for equipment, seven years for furniture and fixtures, five years for tooling and 
three years for computer equipment. Leasehold improvements are depreciated over the lesser of their useful life or the lease 
term. Maintenance and repair costs are charged to expense as incurred. Major overhauls that extend the useful lives of existing 
assets are capitalized. 

Goodwill 

The Company annually tests goodwill for impairment on the first day of its fiscal fourth quarter, or more frequently if an 
event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its 
carrying value.  

The Company compares each reporting unit’s fair value, estimated based on comparable company market valuations and 
expected future discounted cash flows to be generated by the reporting unit, to its carrying value. For the seven reporting 
units with goodwill, the Company compared the estimated fair value of each reporting unit to its carrying value. The results 
of the goodwill impairment test as of October 1, 2017 indicated that the estimated fair values for each of the seven reporting 
units exceeded their respective carrying values. As of the most recent annual test conducted on October 1, 2017, the Company 
noted that the excess of fair value over the carrying value, was 161%, 314%, 247%, 218%, 100%, 25%, and 248% for its 
reporting  units;  Electronics  (non-silicon),  Electronics  (silicon),  Passenger  Car,  Commercial  Vehicle  Products,  Sensors, 
Relays, and Power Fuse, respectively. Relatively small changes in the Company’s key assumptions would not have resulted 
in any reporting units failing the goodwill impairment test. See Note 4, Goodwill and Other Intangible Assets, for additional 
information.  

42 

 
 
  
   
  
  
  
  
  
  
  
  
  
  
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

The  Company  also  performs  an  interim  review  for  indicators  of  impairment  each  quarter  to  assess  whether  an  interim 
impairment review is required for any reporting unit. As part of its interim reviews, management analyzes potential changes 
in the value of individual reporting units based on each reporting unit’s operating results for the period compared to expected 
results as of the prior year’s annual impairment test. In addition, management considers how other key assumptions, including 
discount rates and expected long-term growth rates, used in the last annual impairment test, could be impacted by changes in 
market conditions and economic events. Based on the interim assessments as of December 30, 2017, management concluded 
that no events or changes in circumstances indicated that it was more likely than not that the fair value for any reporting unit 
had declined below its carrying value. 

Long-Lived Assets 

Customer relationships, trademarks and tradenames are amortized using the straight-line method over estimated useful lives 
that  have  a  range  of  five  to  20  years.  Patents,  licenses  and  software  are  amortized  using  the  straight-line  method  or  an 
accelerated method over estimated useful lives that have a range of five to 17 years. The distribution networks are amortized 
on either a straight-line or accelerated basis over estimated useful lives that have a range of three to 20 years.  

The Company assesses potential impairments to its long-lived assets if events or changes in circumstances indicate that the 
carrying amount of an asset may not be recoverable. An impaired asset is written down to its estimated fair value based upon 
the most recent information available. Estimated fair market value is generally measured by discounting estimated future 
cash flows. Long-lived assets, other than goodwill and other intangible assets, that are held for sale are recorded at the lower 
of carrying value or the fair market value less the estimated cost to sell. 

During the year ended December 31, 2016, the Company recognized non-cash impairment charges totaling $6.0 million, of 
which $2.2 million related to the impairment of certain customer relationship intangible assets in the customs reporting unit 
within the Industrial segment and $3.8 million related to the impairment of the Custom Products tradename. The impairment 
of the customer relationship intangible assets resulted from lower expectations of future revenue to be derived from those 
relationships while the tradename impairment resulted from lower expectations of future cash flows of the customs reporting 
unit.  

Environmental Liabilities 

Environmental liabilities are accrued based on engineering studies estimating the cost of remediating sites. Expenses related 
to on-going maintenance of environmental sites are expensed as incurred. If actual or estimated probable future losses exceed 
the Company’s recorded liability for such claims, the Company would record additional charges during the period in which 
the actual loss or change in estimate occurred. 

Pension and Other Post-retirement Benefits 

The Company records annual income and expense amounts relating to its pension and post-retirement benefits plans based 
on calculations which include various actuarial assumptions including discount rates, expected long-term rates of return and 
compensation increases. The Company reviews its actuarial assumptions on an annual basis as of the fiscal year-end balance 
sheet date (or more frequently if a significant event requiring remeasurement occurs) and modifies the assumption based on 
current  rates  and  trends  when  it  is  appropriate  to  do  so.  The  effects  of  modifications  are  recognized  immediately  on  the 
Consolidated  Balance  Sheets,  but  are  generally  amortized  into  operating  earnings  over  future  periods,  with  the  deferred 
amount recorded in accumulated other comprehensive income (loss). The Company believes that the assumptions utilized in 
recording its obligations under its plans are reasonable based on its experience, market conditions and input from its actuaries 
and investment advisors. 

Revenue Recognition 

The Company recognizes revenue on product sales in the period in which the sales process is complete. This generally occurs 
when persuasive evidence of an arrangement exists, products are shipped (FOB origin) to the customer in accordance with 
the terms of the sale, the risk of loss has been transferred, collectability is reasonably assured, and the pricing is fixed and 
determinable. 

At the end of each period, for those shipments where title to the products and the risk of loss and rewards of ownership do 
not transfer until the product has been received by the customer, the Company adjusts revenues and cost of sales for the delay 

43 

 
 
  
  
  
   
  
  
  
  
  
  
  
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

between the time that the products are shipped and when they are received by the customer. The Company’s distribution 
channels are primarily through direct sales and independent third-party distributors.  

Revenue and Billing 

The Company generally accepts orders from customers based on long term purchasing contracts and written sales agreements. 
Contract  pricing  and  selling  agreement  terms  are  based  on  market  factors,  costs,  and  competition.  Pricing  normally  is 
negotiated as an adjustment (premium or discount) from the Company’s published price lists. The customer is invoiced when 
the Company’s products are shipped to them in accordance with the terms of the sales agreement. 

Returns and Credits 

Some of the terms of the Company’s sales agreements and normal business conditions provide customers (distributors) the 
ability to receive price adjustments on products previously shipped and invoiced. This practice is common in the industry and 
is referred to as a “ship and debit” program. This program allows the distributor to debit the Company for the difference 
between the distributors’ contracted price and a lower price for specific transactions. Under certain circumstances (usually in 
a competitive situation or large volume opportunity), a distributor will request authorization to reduce its price to its buyer. 
If the Company approves such a reduction, the distributor is authorized to “debit” its account for the difference between the 
contracted price and the lower approved price. The Company establishes reserves for this program based on historic activity 
and actual authorizations for the debit and recognizes these debits as a reduction of revenue.  

Return to Stock  

The Company has a return to stock policy whereby a customer with prior authorization from Littelfuse management can 
return previously purchased goods for full or partial credit. The Company establishes an estimated allowance for these returns 
based on historic activity. Sales revenue and cost of sales are reduced to anticipate estimated returns. 

Volume Rebates 

The Company offers incentives to certain customers to achieve specific quarterly or annual sales targets. If customers achieve 
their sales targets, they are entitled to rebates. The Company estimates the future cost of these rebates and recognizes this 
estimated cost as a reduction to revenue as products are sold. 

Allowance for Doubtful Accounts 

The Company evaluates the collectability of its trade receivables based on a combination of factors. The Company regularly 
analyzes its significant customer accounts and, when the Company becomes aware of a specific customer’s inability to meet 
its financial obligations, the Company records a specific reserve for bad debt to reduce the related receivable to the amount 
the Company reasonably believes is collectible. The Company also records allowances for all other customers based on a 
variety  of  factors  including  the  length  of  time  the  receivables  are  past  due,  the  financial  health  of  the  customer, 
macroeconomic considerations and past experience. Accounts receivable balances that are deemed to be uncollectible, are 
written off against the reserve on a case-by-case basis. Historically, the allowance for doubtful accounts has been adequate 
to cover bad debts. If circumstances related to specific customers change, the estimates of the recoverability of receivables 
could  be  further  adjusted.  However,  due  to  the  Company’s  diverse  customer  base  and  lack  of  credit  concentration,  the 
Company does not believe its estimates would be materially impacted by changes in its assumptions. 

Advertising Costs 

The Company expenses advertising costs as incurred, which amounted to $2.9 million in both 2017 and 2016 and $2.3 million 
in 2015, respectively, and are included as a component of selling, general, and administrative expenses. 

Shipping and Handling Fees and Costs 

Amounts  billed  to  customers  related  to  shipping  and  handling  is  classified  as  revenue.  Costs  incurred  for  shipping  and 
handling  of  $10.9  million  $9.1  million,  and  $7.0  million  in  2017,  2016,  and  2015,  respectively,  are  classified  in  selling, 
general, and administrative expenses. 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

Foreign Currency Translation / Remeasurement 

The Company’s foreign subsidiaries use the local currency or the U.S. dollar as their functional currency, as appropriate. 
Assets and liabilities are translated using exchange rates at the balance sheet date, and revenues and expenses are translated 
at  weighted  average  rates.  The  amount  of  foreign  currency  gain  or  loss  from  remeasurement  recognized  in  the  income 
statement was a loss of $2.4 million in 2017, a loss of $0.5 million in 2016, and a gain of $1.5 million in 2015. Adjustments 
from the translation process are recognized in “Shareholders’ equity” as a component of “Accumulated other comprehensive 
income.” 

Stock-based Compensation 

The Company recognizes compensation expense for the cost of awards of equity compensation using a fair value method. 
Benefits of tax deductions in excess of recognized compensation expense are reported as operating cash flows. See Note 9, 
Shareholders’ Equity, for additional information on stock-based compensation. 

Coal Mining Liability 

Included in other long-term liabilities is an accrual related to former coal mining operations at Littelfuse GmbH (formerly 
known as Heinrich Industries, AG) for the amounts of €0.9 million ($1.1 million) and €1.4 million ($1.5 million) at December 
30, 2017 and December 31, 2016, respectively.  Management, in conjunction with an independent third-party, performs an 
annual evaluation of the former coal mining operations in order to develop an estimate of the probable future obligations in 
regard  to  remediating  the  dangers  (such  as  a  shaft  collapse)  of  abandoned  coal  mine  shafts  in  the  former  coal  mining 
operations. Management accrues for costs associated with such remediation efforts based on management's best estimate 
when  such  costs  are  probable  and  reasonably  able  to  be  estimated.  The  ultimate  determination  can  only  be  done  after 
respective investigations because the concrete conditions are mostly unknown at this time. The accrual is not discounted as 
management cannot reasonably estimate when such remediation efforts will take place. 

Other Expense (Income), Net 

Other expense (income), net generally consists of interest income, royalties, and non-operating income. 

Income Taxes 

The Company accounts for income taxes using the liability method. Deferred taxes are recognized for the future effects of 
temporary differences between financial and income tax reporting using enacted tax rates in effect for the years in which the 
differences  are  expected  to  reverse.  The  Company  recognizes  deferred  taxes  for  temporary  differences,  operating  loss 
carryforwards and tax credit carryforwards. Deferred tax assets are reduced by a valuation allowance if it is more likely than 
not that some portion, or all, of the deferred tax assets will not be realized. U.S. state and non-U.S. income taxes are provided 
on the portion of non-U.S. income that is expected to be remitted to the U.S. and be taxable (and non-U.S. income taxes are 
provided on the portion of non-U.S. income that is expected to be remitted to an upper-tier non-U.S. entity). Deferred tax 
assets and liabilities are adjusted for the effects of changes in tax laws and rates on the date of enactment.  

Deferred U.S. income taxes and non-U.S. taxes are not provided on the excess of the investment value for financial reporting 
over  the  tax  basis  of  investments  in  those  non-U.S.  subsidiaries  for  which  such  excess  is  considered  to  be  permanently 
reinvested in those operations. Management regularly evaluates whether non-U.S. earnings are expected to be permanently 
reinvested.  This  evaluation  requires  judgment  about  the  future  operating  and  liquidity  needs  of  the  Company’s  foreign 
subsidiaries.  Changes in economic and business conditions, non-U.S. or U.S. tax laws, or the Company’s financial situation 
could result in changes to these judgments and the need to record additional tax liabilities. 

The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position 
will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits 
recognized in the financial statements from such a position are measured based on the largest benefit that has a greater than 
50% likelihood of being realized upon ultimate settlement. 

On December 22, 2017, the U.S. enacted legislation commonly referred to as the Tax Cuts and Jobs Act (the "Tax Act"). 
Among other things, the Tax Act reduces the U.S. corporate federal income tax rate from 35% to 21%, adds base broadening 
provisions  which  limit  deductions  and  address  excessive  international  tax  planning,  imposes  a  one-time  tax  (the  “Toll 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

Charge”)  on  accumulated  earnings  of  certain  non-U.S.  subsidiaries  and  enables  repatriation  of  earnings  of  non-U.S. 
subsidiaries free of U.S. federal income tax. Other than the Toll Charge (which is applicable to the Company for 2017), the 
provisions will generally be applicable to the Company in 2018 and beyond.  

In accordance with the guidance provided in SEC Staff Accounting Bulletin (“SAB”) No. 118, in the fourth quarter of 2017 
the Company recorded a charge of $47 million as a provisional reasonable estimate of the impact of the Tax Act, including 
$49 million for the Toll Charge net of $2 million for other net tax benefits. The Company is continuing to analyze the Tax 
Act and plans to finalize the estimate within the measurement period outlined in SAB No.118. The final charge may differ 
from the provisional reasonable estimate if provisions of the Tax Act, and their interaction with other provisions of the U.S. 
Internal Revenue Code, are interpreted differently than interpretations made by the Company in determining the estimate, 
whether  through  issuance  of  administrative  guidance,  or  through  further  review  of  the  Tax  Act  by  the  Company  and  its 
advisors. Aside from these interpretation issues, the final charge may differ from the provisional reasonable estimate due to 
refinements of accumulated non-U.S. earnings and tax pool data. 

One of the base broadening provisions of the Tax Act is commonly referred to as the global intangible low-taxed income 
“GILTI” provisions. In accordance with guidance issued by the FASB staff, the Company has not adopted an accounting 
policy for GILTI. Thus, the U.S. balance sheet tax accounts, notably deferred taxes, were computed without consideration of 
the possible future impact of the GILTI provisions. The Company intends to adopt an accounting policy for GILTI within the 
measurement period outlined in SAB 118.  

Fair Value Measurements 

Certain assets and liabilities are required to be recorded at fair value on a recurring basis. Fair value is determined based on 
the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most 
advantageous market for the asset or liability in an orderly transaction between market participants. The Company records 
the fair value of its available-for-sale securities and pension plan assets on a recurring basis. Assets measured at fair value on 
a nonrecurring basis include long-lived assets held and used, long-lived assets held for sale, goodwill and other intangible 
assets. The fair value of cash and cash equivalents, accounts receivable, short-term debt and accounts payable approximate 
their carrying values. The three-tier value hierarchy, which prioritizes valuation methodologies based on the reliability of the 
inputs, is: 

Level 1 – Valuations based on quoted prices for identical assets and liabilities in active markets. 

Level 2 – Valuations based on observable inputs other than quoted prices included in Level 1, such as quoted prices 
for  similar  assets  and  liabilities  in  active  markets,  quoted  prices  for  identical  or  similar  assets  and  liabilities  in 
markets that are not active, or other inputs that are observable or can be corroborated by observable market data. 

Level  3  –  Valuations  based  on  unobservable  inputs  reflecting  the  Company’s  own  assumptions,  consistent  with 
reasonably available assumptions made by other market participants. 

Reclassifications 

Certain reclassifications of prior year amounts for Trade receivables, net and Prepaid expenses and other current assets were 
made to conform to the 2017 presentation. 

Recently Adopted Accounting Standards 

In July 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2015-
11 – “Inventory (Topic 330): Simplifying the Measurement of Inventory,” which simplifies the measurement of inventory by 
requiring  inventory  to  be  measured  at  the  lower  of  cost  and  net  realizable  value.  The  update  is  effective  for  financial 
statements  issued  for  fiscal  years  beginning  after  December  15,  2016,  and  interim  periods  within  those  fiscal  years.  The 
Company adopted the new standard on January 1, 2017. The adoption of the update did not have a material impact on the 
Company’s consolidated financial position and results of operations. As a result of the adoption of the update, inventories are 
stated at the lower of cost or net realizable value. Cost is principally determined using the first-in, first-out method. The 
Company  maintains  excess  and  obsolete  allowances  against  inventory  to  reduce  the  carrying  value  to  the  expected  net 
realizable  value.  These  allowances  are  based  upon  a  combination  of  factors  including  historical  sales  volume,  market 
conditions, lower of cost or market analysis and expected realizable value of the inventory. 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

In  March  2016,  the  FASB  issued  ASU  No.  2016-09  –  “Improvements  to  Employee  Share-Based  Payment  Accounting,” 
which amends ASC 718, “Compensation – Stock Compensation.” The update simplifies several aspects of the accounting for 
employee share-based payment transactions, including accounting for income taxes, forfeitures, and statutory withholding 
requirements, as well as classification in the Consolidated Statements of Cash Flows. The update is effective for financial 
statements  issued  for  fiscal  years  beginning  after  December  15,  2016,  and  interim  periods  within  those  fiscal  years.  The 
Company adopted the new standard on January 1, 2017. As a result of the adoption, on a prospective basis, the Company 
recognized $2.0 million of excess tax benefits from stock-based compensation as a discrete item in income tax expense for 
the year ended December 30, 2017. Historically, these amounts were recorded as additional paid-in capital. The Company 
also elected to apply the change prospectively to the Consolidated Statements of Cash Flows. As a result, on a prospective 
basis,  share-based  payments  will  be  reported  as  operating  activities  in  the  Consolidated  Statements  of  Cash  Flows.  The 
Company elected not to change its policy on accounting for forfeitures and will continue to estimate a requisite forfeiture 
rate. Additional amendments to the accounting for income taxes and minimum statutory withholding requirements had no 
impact on the results of operations. 

In January 2017, the FASB issued ASU No. 2017-04, “Intangibles-Goodwill and Other” (Topic 350). This ASU modifies the 
concept of impairment from the condition that exists when the carrying amount of goodwill exceeds its implied fair value to 
the condition that exists when the carrying amount of a reporting unit exceeds its fair value. An entity no longer will determine 
goodwill impairment by calculating the implied fair value of goodwill by assigning the fair value of a reporting unit to all of 
its assets and liabilities as if that reporting unit had been acquired in a business combination. Because the update will eliminate 
Step 2 from the goodwill impairment test, it should reduce the cost and complexity of evaluating goodwill for impairment. 
This ASU is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2020, 
with early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 
2017. The ASU did not impact the Company in 2017. 

Recently Issued Accounting Standards 

In October 2016, the FASB issued ASU No. 2016-16, "Income Taxes” (Topic 740). This ASU update requires entities to 
recognize the income tax consequences of many intercompany asset transfers at the transaction date. The seller and buyer 
will immediately recognize the current and deferred income tax consequences of an intercompany transfer of an asset other 
than inventory. The tax consequences were previously deferred. The guidance is effective for fiscal years, and interim periods 
within those fiscal years, beginning after December 15, 2017, with early adoption permitted. Adoption will require a modified 
retrospective transition, and is not expected to have a material impact. 

In  March  2016,  the  FASB  issued  ASU  No.  2016-09  –  “Improvements  to  Employee  Share-Based  Payment  Accounting,” 
which amends ASC 718, “Compensation – Stock Compensation.” The update simplifies several aspects of the accounting for 
employee share-based payment transactions, including accounting for income taxes, forfeitures, and statutory withholding 
requirements, as well as classification in the Consolidated Statements of Cash Flows. The update is effective for financial 
statements  issued  for  fiscal  years  beginning  after  December  15,  2016,  and  interim  periods  within  those  fiscal  years.  The 
Company adopted the new standard on January 1, 2017. As a result of the adoption, on a prospective basis, the Company 
recognized $2.0 million of excess tax benefits from stock-based compensation as a discrete item in income tax expense for 
the year ended December 30, 2017. Historically, these amounts were recorded as additional paid-in capital. The Company 
also elected to apply the change prospectively to the Consolidated Statements of Cash Flows. As a result, on a prospective 
basis,  share-based  payments  will  be  reported  as  operating  activities  in  the  Consolidated  Statements  of  Cash  Flows.  The 
Company elected not to change its policy on accounting for forfeitures and will continue to estimate a requisite forfeiture 
rate. Additional amendments to the accounting for income taxes and minimum statutory withholding requirements had no 
impact on the results of operations. 

In January 2016, the FASB issued ASU No. 2016-01, “Financial Instruments-Recognition and Measurement of Financial 
Assets and Financial Liabilities” which addresses certain aspects of the recognition, measurement, presentation and disclosure 
of financial instruments. The ASU will require the Company to recognize any changes in the fair value of certain equity 
investments in net income. These changes are currently recognized in other comprehensive income ("OCI"). This guidance 
is effective for interim and fiscal years beginning after December 15, 2017. 

In February 2016, the FASB issued ASU No. 2016-02, "Leases" (Topic 842). This ASU requires lessees to recognize, on the 
balance  sheet,  assets  and  liabilities  for  the  rights  and  obligations  created  by  leases  of  greater  than  twelve  months.  The 
accounting by lessors will remain largely unchanged. The ASU is effective for fiscal years, and interim periods within those 
fiscal  years,  beginning  after  December  15,  2018,  with  early  adoption  permitted.  Adoption  will  require  a  modified 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

retrospective transition, and the Company plans to adopt the standard in the first quarter of 2019. The Company is currently 
evaluating the impact of ASU 2016-02. 

In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers” (Topic 606) which supersedes 
the revenue recognition requirements in ASC 605, “Revenue Recognition.” This ASU provides a single comprehensive model 
for entities to use in accounting for revenue arising from contracts with customers and will supersede most current revenue 
recognition guidance. The guidance permits two implementation approaches, one requiring retrospective application of the 
new standard with restatement of prior years and one requiring prospective application of the new standard with disclosure 
of results under old standards. In August, 2015, the FASB issued ASU No. 2015-14, which postponed the effective date of 
ASU No. 2014-09 to fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017, with 
early adoption permitted on the original effective date of fiscal years beginning after December 15, 2016. The Company is in 
the process of finalizing its assessment and the documentation of its evaluation of the new standard. The majority of the 
Company’s revenue arrangements generally consist of a single performance obligation to transfer promised finished goods. 
Based on the Company’s evaluation process completed and review of its contracts with customers, the timing and amount of 
revenue recognized based on ASU 2015-14 is consistent with its revenue recognition policy under previous guidance. The 
Company adopted the new standard effective December 31, 2017, using the modified retrospective approach, and will expand 
its consolidated financial statement disclosures in order to comply with the ASU. The Company has determined the adoption 
of ASU 2015-14 will not have a material impact on its results of operations, cash flows, or financial position. 

2. Acquisitions and Dispositions 

The Company accounts for acquisitions using the acquisition method in accordance with ASC 805, “Business Combinations,” 
in which assets acquired and liabilities assumed are recorded at fair value as of the date of acquisition. The operating results 
of the acquired business are included in the Company’s Consolidated Financial Statements from the date of the acquisition.  

Subsequent Event 

IXYS Corporation 

On January 17, 2018, the Company acquired IXYS Corporation (“IXYS”), a global pioneer in the power semiconductor and 
integrated  circuit  markets  with  a  focus  on  medium  to  high  voltage  power  control  semiconductors  across  the  industrial, 
communications,  consumer  and  medical  markets.  IXYS  has  a  broad  customer  base,  serving  more  than  3,500  customers 
through its direct sales force and global distribution partners. The acquisition of IXYS is expected to accelerate the Company’s 
growth across the power control market driven by IXYS’s extensive power semiconductor portfolio and technology expertise. 
With IXYS, the Company will be able to diversify and expand its presence within industrial electronics markets, leveraging 
the strong IXYS industrial OEM customer base. The Company also expects to increase long-term penetration of its power 
semiconductor portfolio in automotive markets, expanding its global content per vehicle.  

The Company has commenced the determination of the purchase price allocation. Upon completion of the acquisition, at 
IXYS stockholders’ election and subject to proration, each share of IXYS common stock, par value $0.01 per share, owned 
immediately prior to the effective time were cancelled and extinguished and automatically converted into the right to receive: 
(i) $23.00 in cash (subject to applicable withholding tax), without interest (referred to as the cash consideration), or (ii) 0.1265 
of a share of common stock, par value $0.01 per share, of Littelfuse (referred to as the stock consideration and together with 
the  cash  consideration,  the  merger  consideration).  IXYS  stockholders  received  cash  in  lieu  of  any  fractional  shares  of 
Littelfuse  common  stock  that  the  IXYS  stockholders  would  otherwise  have  been  entitled  to  receive.  Additionally,  each 
outstanding option to purchase shares of IXYS common stock granted under an IXYS equity plan were assumed by Littelfuse 
and converted into an option to acquire (i) a number of shares of Littelfuse common stock equal to the number of shares of 
IXYS common stock subject to such option immediately prior to the effective time multiplied by 0.1265, rounded down to 
the nearest whole share, with (ii) an exercise price per share of Littelfuse common stock equal to the exercise price of such 
IXYS stock option immediately prior to the effective time divided by 0.1265, rounded up to the nearest whole cent. 

Based  on  the  $207.5  per  share  opening  price  of  Littelfuse  common  stock  on  January  17,  2018,  the  consideration  IXYS 
stockholders received in exchange of their IXYS common stock in the acquisition had a value of approximately $814.8 million 
comprised of $380.5 million of cash and $434.2 million of Littelfuse stock. In addition to the consideration transferred related 
to IXYS common stock, the value of consideration transferred, and included in the purchase price, related to IXYS stock 
options that were converted to Littelfuse stock options, or cash settled, had a value of approximately $41.7 million. As a 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

result, total consideration is valued at approximately $856.5 million. The Company is in the process of estimating the purchase 
price allocation. 

2017 Acquisitions 

U.S. Sensor  

On July 7, 2017, the Company acquired the assets of U.S. Sensor Corporation (“U.S. Sensor”). The acquisition purchase 
price of $24.3 million, net of the finalization of an income tax gross up which was settled in the fourth quarter of 2017, was 
funded with available cash. The acquired business expands the Company’s existing sensor portfolio in several key electronics 
and industrial end markets. U.S. Sensor manufactures a variety of high quality negative temperature coefficient thermistors 
as well as thermistor probes and assemblies. Product lines also include thin film platinum resistance temperature detectors 
(“RTDs”) and RTD assemblies.  

The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in 
the U.S. Sensor acquisition: 

(in thousands) 
Total purchase consideration: 

Purchase 
Price 
Allocation 

Cash ........................................................................................................................................................    $ 

24,340  

Allocation of consideration to assets acquired and liabilities assumed: 

Current assets, net ..................................................................................................................................    $ 
Patented and unpatented technologies ....................................................................................................      
Trademarks and tradenames  ..................................................................................................................      
Non-compete agreement ........................................................................................................................      
Customer relationships ........................................................................................................................... 
Goodwill.................................................................................................................................................      
Current liabilities ....................................................................................................................................      
   $ 

4,635  
1,090  
200  
50  
2,830  
16,075  
(540) 
24,340  

Included in U.S. Sensor’s current assets, net was approximately $1.5 million of receivables. All U.S. Sensor goodwill, other 
assets and liabilities were recorded in the Electronics segment and reflected in the United States geographic area. The goodwill 
resulting from this acquisition consists largely of the Company’s expected future product sales and synergies from combining 
U.S. Sensor’s products and technology with the Company’s existing electronics product portfolio. Goodwill for the above 
acquisition is expected to be deductible for tax purposes. 

As required by purchase accounting rules, the Company recorded a $1.6 million step-up of inventory to its fair value as of 
the acquisition date based on the preliminary valuation. The step-up was amortized as a non-cash charge to cost of goods sold 
during the third quarter of 2017, as the acquired inventory was sold, and reflected as other non-segment costs. 

Monolith  

In December 2015, the Company invested $3.5 million in the preferred stock of Monolith Semiconductor Inc. (“Monolith”), 
a U.S. start-up Company developing silicon carbide technology, which represented approximately 12% of the common stock 
of Monolith on an as-converted basis. The Company accounted for its investment in Monolith under the cost method with 
any changes in value recorded in other comprehensive income. The value of the Monolith investment was $3.5 million at 
December 31, 2016.  

On February 28, 2017, pursuant to a Securities Purchase Agreement between the Company and the stockholders of Monolith 
and  conditioned  on  Monolith  achieving  a  product  development  milestone  and  other  provisions,  the  Company  acquired 
approximately  62%  of  the  outstanding  common  stock  of  Monolith  for  $15  million.  The  Securities  Purchase  Agreement 
includes  provisions  whereby  the  Company  will  acquire  the  remaining  outstanding  stock  of  Monolith  (“non-controlling 
interest”) at a time or times based on Monolith meeting certain technical and sales targets. Consideration for the additional 
investment(s) will range from $1.0 million to $10 million and will be paid no later than June 30, 2019. 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

The additional investment resulted in the Company gaining control of Monolith and was accounted for as a step-acquisition 
with the fair value of the original investment immediately before the acquisition estimated to be approximately $3.5 million. 
As the fair value of the investment immediately prior to the transaction equaled the carrying value, there was no impact on 
the Company’s Consolidated Statements of Net Income. As the Securities Purchase Agreement includes an obligation of the 
Company  to  mandatorily  redeem  the  non-controlling  interest  for  cash,  the  fair  value  of  the  non-controlling  interest  was 
recognized as a liability on the Company’s Consolidated Balance Sheets. Changes in the fair value of the non-controlling 
interest are recognized in the Company’s Consolidated Statements of Net Income. 

Commencing  March  1,  2017,  Monolith  was  reflected  as  a  consolidated  subsidiary  within  the  Company’s  Consolidated 
Financial Statements. Had the acquisition occurred as of January 1, 2017, the impact on the Company’s consolidated results 
of operations would not have been material. 

The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in 
the Monolith acquisition: 

(in thousands) 
Total purchase consideration: 

Purchase Price 
Allocation 

Original investment ................................................................................................................................   $ 
Cash, net of cash acquired ......................................................................................................................     
Fair value of commitment to purchase non-controlling interest .............................................................     
Total purchase consideration ..................................................................................................................   $ 

Allocation of consideration to assets acquired and liabilities assumed: 

Current assets, net ..................................................................................................................................   $ 
Property, plant, and equipment ..............................................................................................................     
Patented and unpatented technologies ....................................................................................................     
Non-compete agreement ........................................................................................................................     
Goodwill.................................................................................................................................................     
Current liabilities ....................................................................................................................................     
Other non-current liabilities ...................................................................................................................     
  $ 

3,500  
14,172  
9,000  
26,672  

891  
789  
6,720  
140  
20,641  
(639) 
(1,870) 
26,672  

Included in Monolith’s current assets, net was approximately $0.7 million of receivables. All Monolith goodwill, other assets 
and liabilities were recorded in the Electronics segment and reflected in the United States geographic area. The goodwill 
resulting from this acquisition consists largely of the Company’s expected future product sales and synergies from combining 
Monolith’s  products  and  technology  with  the  Company’s  existing  electronics  product  portfolio.  Goodwill  for  the  above 
acquisition is not expected to be deductible for tax purposes. 

2016 Acquisitions  

ON Portfolio 

On August 29, 2016, the Company acquired certain assets of select businesses (the “ON Portfolio”) of ON Semiconductor 
Corporation for $104.0 million. The Company funded the acquisition with available cash and proceeds from its credit facility. 
The acquired business, which is included in the Electronics segment, consists of a product portfolio that includes transient 
voltage suppression (“TVS”) diodes, switching thyristors and insulated gate bipolar transistors (“IGBTs”) for automotive 
ignition  applications.  The  acquisition  expands  the  Company’s  offerings  in  power  semiconductor  applications  as  well  as 
increases  its  presence  in  the  automotive  electronics  market.  The  ON  Portfolio  products  have  strong  synergies  with  the 
Company’s existing circuit protection business and will strengthen its channel partnerships and customer engagement.  

50 

 
 
   
   
  
  
  
       
  
       
  
  
  
  
  
  
  
 
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in 
the ON Portfolio acquisition:  

(in thousands) 
Total purchase consideration: 

Purchase Price 
Allocation 

Cash ........................................................................................................................................................   $ 

104,000 

Allocation of consideration to assets acquired and liabilities assumed: 

Current assets, net ..................................................................................................................................   $ 
Customer relationships ...........................................................................................................................     
Patented and unpatented technologies ....................................................................................................     
Non-compete agreement ........................................................................................................................     
Goodwill.................................................................................................................................................     
  $ 

4,816 
31,800 
8,800 
2,500 
56,084 
104,000 

All the ON Portfolio business goodwill and other assets were recorded in the Electronics segment and are reflected in the 
Americas and Europe geographic areas. The customer relationships are being amortized over 13.5 years. The patented and 
unpatented technologies are being amortized over 6-8.5 years. The non-compete agreement is being amortized over 4 years. 
The goodwill resulting from this acquisition consists largely of the Company’s expected future product sales and synergies 
from combining the ON Portfolio products with the Company’s existing power semiconductor product portfolio. $7.3 million 
of goodwill for the above acquisition is expected to be deductible for tax purposes.  

As required by purchase accounting rules, the Company recorded a $0.7 million step-up of inventory to its fair value as of 
the acquisition date based on the preliminary valuation. All of the step-up was amortized as a non-cash charge to cost of 
goods sold during 2016, as the acquired inventory was sold, and reflected as other non-segment costs. 

Included in the Company’s Consolidated Statements of Net Income for the year ended December 31, 2016 are net sales of 
approximately $21.8 million since the August 29, 2016 acquisition of the ON Portfolio business. 

Menber’s 

On April 4, 2016, the Company completed the acquisition of Menber’s S.p.A. (“Menber’s”) headquartered in Legnago, Italy 
for  $19.2  million,  net  of  acquired  cash  and  after  settlement  of  a  working  capital  adjustment.  The  Company  funded  the 
acquisition with cash on hand and borrowings under the Company’s revolving credit facility. The acquired business is part 
of  the  Company's  commercial  vehicle  product  business  within  the  Automotive  segment  and  specializes  in  the  design, 
manufacturing, and selling of manual and electrical high current switches and trailer connectors for commercial vehicles. The 
acquisition expands the Company’s commercial vehicle products business globally. 

The following table summarizes the preliminary purchase price allocation of the fair value of assets acquired and liabilities 
assumed in the Menber’s acquisition: 

(in thousands) 
Total purchase consideration: 

Purchase Price 
Allocation 

Cash, net of acquired cash ......................................................................................................................   $ 

19,162  

Preliminary allocation of consideration to assets acquired and liabilities assumed: 

Current assets, net ..................................................................................................................................   $ 
Property, plant, and equipment ..............................................................................................................     
Customer relationships ...........................................................................................................................     
Patented and unpatented technologies ....................................................................................................     
Trademarks and tradenames ...................................................................................................................     
Goodwill.................................................................................................................................................     
Current liabilities ....................................................................................................................................     
Other non-current liabilities ...................................................................................................................     
  $ 

12,919  
1,693  
3,050  
224  
1,849  
8,091  
(7,220) 
(1,444) 
19,162  

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

All Menber’s goodwill and other assets and liabilities were recorded in the Automotive segment and reflected in the Europe 
geographic area. The customer relationships are being amortized over 10 years. The patented and unpatented technologies 
are being amortized over 5 years. The trademarks and tradenames are being amortized over 10 years. The goodwill resulting 
from this acquisition consists largely of the Company’s expected future product sales and synergies from combining Menber’s 
products with the Company’s existing automotive product portfolio. Goodwill for the above acquisition is not expected to be 
deductible for tax purposes.  

As required by purchase accounting rules, the Company recorded a $0.2 million step-up of inventory to its fair value as of 
the acquisition date based on the preliminary valuation. The step-up was amortized as a non-cash charge to cost of goods sold 
during 2016, as the acquired inventory was sold, with the charge reflected as other non-segment costs. 

Included in the Company’s Consolidated Statements of Net Income for the year ended December 31, 2016 are net sales of 
approximately $17.3 million since the April 4, 2016 acquisition of Menber’s.  

PolySwitch 

On March 25, 2016, the Company acquired 100% of the circuit protection business (“PolySwitch”) of TE Connectivity Ltd. 
for $348.3 million, net of acquired cash and after settlement of certain post-closing adjustments. The Company funded the 
acquisition  with  available  cash  on  hand  and  borrowings  under  the  Company’s  revolving  credit  facility.  The  PolySwitch 
business, which is split between the Automotive and Electronics segments, has a leading position in polymer based resettable 
circuit protection devices, with a strong global presence in the automotive, battery, industrial, communications and mobile 
computing  markets.  PolySwitch  has  manufacturing  facilities  in  Shanghai  and  Kunshan,  China  and  Tsukuba,  Japan.  The 
acquisition allows the Company to strengthen its global circuit protection product portfolio, as well as strengthen its presence 
in the automotive electronics and battery end markets. The acquisition also significantly increases the Company’s presence 
in Japan.  

The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in 
the PolySwitch acquisition: 

(in thousands) 
Total purchase consideration: 

Purchase Price 
Allocation 

Original consideration ............................................................................................................................   $ 
Post closing consideration adjustment received .....................................................................................     
Acquired cash .........................................................................................................................................     
Acquired cash to be returned to seller ....................................................................................................     
Total purchase consideration ..................................................................................................................   $ 

Allocation of consideration to assets acquired and liabilities assumed: 

Current assets, net ..................................................................................................................................   $ 
Property, plant, and equipment ..............................................................................................................     
Land lease ..............................................................................................................................................     
Patented and unpatented technologies ....................................................................................................     
Customer relationships ...........................................................................................................................     
Goodwill.................................................................................................................................................     
Other long-term assets ............................................................................................................................     
Current liabilities ....................................................................................................................................     
Other non-current liabilities ...................................................................................................................     
  $ 

350,000   
(1,708 ) 
(3,810 ) 
3,810   
348,292   

60,228   
51,613   
4,290   
56,425   
39,720   
165,088   
11,228   
(35,280 ) 
(5,020 ) 
348,292   

All  PolySwitch  goodwill  and  other  assets  and  liabilities  were  recorded  in  the  Electronics  and  Automotive  segments  and 
reflected in all geographic areas. The customer relationships are being amortized over 15 years. The patented and unpatented 
technologies  are  being  amortized  over  10  years.  The  goodwill  resulting  from  this  acquisition  consists  largely  of  the 
Company’s expected future product sales and synergies from combining PolySwitch products with the Company’s existing 
automotive and electronics product portfolio. $103.8 million and $61.3 million of the goodwill for the above acquisition has 
been assigned to the Electronics and Automotive segments, respectively, with $64.9 million expected to be deductible for tax 
purposes.  

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

As required by purchase accounting rules, the Company recorded a $6.9 million step-up of inventory to its fair value as of 
the acquisition date based on the preliminary valuation. The step-up was amortized as a non-cash charge to cost of goods sold 
during the second quarter of 2016, as the acquired inventory was sold, and reflected as other non-segment costs. 

Included in the Company’s Consolidated Statements of Net Income for the year ended December 31, 2016 are net sales of 
approximately $126.5 million since the March 25, 2016 acquisition of PolySwitch.  

2016 Dispositions 

During the first quarter of 2016, the Company sold its tangible and intangible assets relating to a marine product line that it 
acquired as part of its acquisition of Selco A/S in 2011. In connection with this sale, the Company recorded a loss on sale of 
the product line of $1.4 million reflected within selling, general, and administrative expenses for the year ended December 
31, 2016. This loss was recognized as an “other” charge for segment reporting purposes.  

2015 Acquisitions 

Sigmar S.r.l 

On October 1, 2015, the Company acquired 100% of Sigmar S.r.l. (“Sigmar”). The total purchase price for Sigmar was $6.5 
million, net of cash acquired and including estimated additional net payments of up to $0.9 million, a portion of which is 
subject to the achievement of certain milestones.  

Located in Ozegna, Italy, Sigmar is a leading global manufacturer of water-in-fuel sensors and also manufactures selective 
catalytic reduction (“SCR”) quality sensors and diesel fuel heaters for automotive and commercial vehicle applications. The 
acquisition further expanded the Company’s automotive sensor product line offerings within its Automotive segment. The 
Company funded the acquisition with available cash. 

The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in 
the Sigmar acquisition: 

(in thousands) 
Total purchase consideration: 

Purchase Price 
Allocation 

Cash, net of acquired cash ......................................................................................................................   $ 
Estimated additional consideration payable ...........................................................................................     
Total purchase consideration ..................................................................................................................   $ 

Allocation of consideration to assets acquired and liabilities assumed: 

Current assets, net ..................................................................................................................................   $ 
Property, plant, and equipment ..............................................................................................................     
Goodwill.................................................................................................................................................     
Patents ....................................................................................................................................................     
Current liabilities ....................................................................................................................................     
Other non-current liabilities ...................................................................................................................     
  $ 

5,558  
901  
6,459  

2,519  
1,097  
4,084  
2,845  
(1,518) 
(2,568) 
6,459  

All Sigmar goodwill and other assets and liabilities were recorded in the Automotive segment and reflected in the Europe 
geographic area. The patents are being amortized over 10 years. The goodwill resulting from this acquisition consists largely 
of  the  Company’s  expected  future  product  sales  and  synergies  from  combining  Sigmar’s  products  with  the  Company’s 
existing automotive product offerings. Goodwill for the above acquisition is not expected to be deductible for tax purposes. 

Pro Forma Results 

The following table summarizes, on a pro forma basis, the combined results of operations of the Company and the acquired 
PolySwitch and the ON Portfolio businesses as though the acquisitions had occurred as of December 28, 2014. The Company 
has not included pro forma results of operations for Menber’s or Sigmar as these results were not material to the Company. 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

The pro forma amounts presented are not necessarily indicative of either the actual consolidated results had the PolySwitch 
or ON Portfolio acquisitions occurred as of December 28, 2014 or of future consolidated operating results. 

(in thousands, except per share amounts) 
Net sales ..........................................................................................................................   $
Income before income taxes ............................................................................................     
Net income ......................................................................................................................     
Net income per share — basic .........................................................................................     
Net income per share — diluted ......................................................................................     

For the Year Ended 
2015 
2016 
1,104,838  
1,130,645     $
120,370  
143,110       
92,983  
124,388       
4.12  
5.51       
4.09  
5.47       

Pro forma results presented above primarily reflect: (i) incremental depreciation relating to fair value adjustments to property, 
plant,  and  equipment;  (ii)  amortization  adjustments  relating  to  fair  value  estimates  of  intangible  assets;  (iii)  incremental 
interest expense on assumed indebtedness; and (iv) additional cost of goods sold relating to the capitalization of gross profit 
as part of purchase accounting recognized for purposes of the pro forma as if it was recognized during the Company’s first 
quarter of 2015. Pro forma adjustments described above have been tax affected using the Company's effective rate during the 
respective periods. 

The historical PolySwitch and ON Portfolio business results for the years ended December 31, 2016 and January 2, 2016 do 
not include a provision for income taxes. Income tax expense for the historical PolySwitch business was only provided at the 
end of the business’s fiscal year ended September 25, 2015. Income tax expense for the historical ON Portfolio business was 
not provided on a standalone basis. 

3. Inventories 

The components of inventories at December 30, 2017 and December 31, 2016 are as follows: 

(in thousands) 
Raw materials ..................................................................................................................   $
Work in process ...............................................................................................................     
Finished goods.................................................................................................................     
Total .........................................................................................................................   $

2017 

2016 

39,030     $
27,454       
74,305       
140,789     $

32,231  
23,354  
58,478  
114,063  

4. Goodwill and Other Intangible Assets 

The amounts for goodwill and changes in the carrying value by segment are as follows: 

(in thousands) 
As of January 2, 2016 ...................................................................   $ 
Additions(a) ...............................................................................     
Impairments(b) ...........................................................................     
Adjustments(c) ...........................................................................     

58,246    $
162,172      
—      
(4,653)     
As of December 31, 2016 .............................................................   $  215,765    $
36,716      
26,478      
As of December 30, 2017 .............................................................   $  278,959    $

  Electronics     Automotive     Industrial     
51,259    $
—      
(8,794)     
729      
43,194    $
—      
(4,568)     
38,626    $

Additions(d) ...............................................................................     
Adjustments(e) ...........................................................................     

80,262    $ 
70,762      
—      
(6,439)     
144,585    $ 
—      
(8,756)     
135,829    $ 

Total 
189,767  
232,934  
(8,794) 
(10,363) 
403,544  
36,716  
13,154  
453,414  

   (a) The 2016 additions resulted primarily from the acquisitions of PolySwitch, ON and Menber’s.  

(b) The 2016 impairments in the Industrial segment was due to the $8.8 million impairment of Custom Products reporting

unit goodwill.  

   (c)  Adjustments in 2016 reflect the impact of changes in foreign exchange rates.  

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

   (d) The 2017 additions resulted from the acquisitions of U.S. Sensor and Monolith. 

(e) Adjustments in 2017 reflect adjustments to reclass goodwill by segment as well as the impact of changes in foreign
exchange  rates.  The  impact  of  the  reclassification  was  an  increase  in  goodwill  to  the  Electronics  segment  of  $21.6
million and a decrease of goodwill of  $16.8 million and $4.8 million to the Automotive segment and the Industrial
segment, respectively. 

Due to negative events in the potash market in 2016, management revisited its long-term projections and conducted a step 
one goodwill impairment analysis for its Custom Products reporting unit in the third quarter of 2016. The reporting unit failed 
the step one test and management conducted a step two analysis. The fair value of the unit was estimated using the expected 
present value of future cash flows over a seven-year forecast period and appraisal of certain assets. As a result, the Company 
recognized a charge for goodwill impairment of $8.8 million as it wrote off the entire goodwill balance.  

The components of other intangible assets at December 30, 2017 and December 31, 2016 are as follows: 

As of December 30, 2017 

(in thousands) 
Patents, licenses and software ......................................................   
Distribution network ....................................................................   
Customer relationships, trademarks and tradenames ....................   
Total ......................................................................................   

(in thousands) 
Patents, licenses and software ......................................................   
Distribution network ....................................................................   
Customer relationships, trademarks and tradenames ....................   
Total ......................................................................................   

Weighted 
Average  
Useful Life     
11.4 
12.1 
15.6 

Gross  
Carrying  
Value 
    $  141,520     $ 
46,233       
162,679       
     $  350,432     $ 

Accumulated 
Amortization     
59,609    $
33,361      
53,612      
146,582    $

Net Book  
Value 

81,911   
12,872   
109,067   
203,850   

As of December 31, 2016 

Weighted 
Average  
Useful Life     
11.4 
12.1 
14.4 

Gross 
Carrying  
Value 
    $  131,611     $ 
49,150       
150,887       
     $  331,648     $ 

Accumulated 
Amortization     
48,004    $
30,155      
40,463      
118,622    $

Net Book  
Value 

83,607   
18,995   
110,424   
213,026   

During the year ended December 31, 2016, the Company recognized non-cash impairment charges totaling $6.0 million, of 
which  $2.2  million  related  to  the  impairment  of  certain  customer  relationship  intangible  assets  in  the  Custom  Products 
reporting unit within the Industrial segment and $3.8 million related to the impairment of the Custom Products tradename. 
The impairment of the customer relationship intangible assets resulted from lower expectations of future revenue to be derived 
from those relationships while the tradename impairment resulted from lower expectations of future cash flows of the Custom 
Products reporting unit.  

During the years ended December 30, 2017 and December 31, 2016, the Company recorded additions to other intangible 
assets of $11.0 million and $144.4 million, respectively, for acquisitions during those years, the components of which were 
as follows: 

2017 

2016 

(in thousands) 
Patents, licenses and software ......................................................   
Customer relationships, trademarks and tradenames ....................   
Total ......................................................................................   

Weighted 
Average  
Useful Life     
9.6 
9.0 

    $ 

     $ 

Weighted  
Average  
Useful Life     
9.6 
13.5 

    $ 

     $ 

Amount 

65,449  
78,919  
144,368  

Amount 

7,810    
3,220     
11,030     

For intangible assets with definite lives, the Company recorded amortization expense of $24.7 million, $19.3 million, and 
$11.9 million in 2017, 2016, and 2015, respectively. 

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Estimated amortization expense related to intangible assets with definite lives at December 30, 2017 is as follows: 

(in thousands) 
2018 ...............................................................................................................................................................    $ 
2019 ...............................................................................................................................................................      
2020 ...............................................................................................................................................................      
2021 ...............................................................................................................................................................      
2022 ...............................................................................................................................................................      
2023 and thereafter ........................................................................................................................................      
  $ 

Amount 

25,689 
25,528 
24,879 
23,093 
22,058 
82,603 
203,850 

5. Lease Commitments 

The Company leases certain office and warehouse space as well as certain machinery and equipment under non-cancellable 
operating leases. Rent expense under these leases was $11.6 million, $12.6 million, and $11.1 million in 2017, 2016, and 
2015, respectively. 

Rent expense is recognized on a straight-line basis over the term of the leases. The difference between straight-line basis rent 
and the amount paid has been recorded as accrued lease obligations. The Company also has leases that have lease renewal 
provisions. As of December 30, 2017, all operating leases outstanding were with third parties. The Company did not have 
any capital leases as of December 30, 2017. 

Future minimum payments for all non-cancellable operating leases with initial terms of one year or more at December 30, 
2017 are as follows: 

(in thousands) 
2018 ...............................................................................................................................................................   $ 
2019 ...............................................................................................................................................................     
2020 ...............................................................................................................................................................     
2021 ...............................................................................................................................................................     
2022 ...............................................................................................................................................................     
2023 and thereafter ........................................................................................................................................     
  $ 

Future 
Minimum 
Payments 

10,842   
6,194   
5,425   
4,632   
3,464   
5,021   
35,578   

6. Debt 

The carrying amounts of debt at December 30, 2017 and December 31, 2016 are as follows: 

(in thousands) 
Revolving Credit Facility ................................................................................................   $
Term Loan .......................................................................................................................     
Entrusted loan ..................................................................................................................     
Euro Senior Notes, Series A due 2023 ............................................................................     
Euro Senior Notes, Series B due 2028 ............................................................................     
U.S. Senior Notes, Series A due 2022 .............................................................................     
U.S. Senior Notes, Series B due 2027 .............................................................................     
Unamortized debt issuance costs .....................................................................................     
Total debt .....................................................................................................................     
Less: Current maturities ..................................................................................................     
Total long-term debt ....................................................................................................   $

2017 

2016 

—     $
122,500       
—       
139,623       
113,369       
25,000       
100,000       
(4,881 )     
495,611       
(6,250 )     
489,361     $

112,500  
120,313  
3,522  
122,313  
99,314  
—  
—  
(3,820) 
454,142  
(6,250) 
447,892  

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

Revolving Credit Facility / Term Loan 

On March 4, 2016, the Company entered into a five-year credit agreement (“Credit Agreement”) with a group of lenders for 
up to $700.0 million. The Credit Agreement consisted of an unsecured revolving credit facility (“Revolving Credit Facility”) 
of $575.0 million and an unsecured term loan credit facility (“Term Loan”) of up to $125.0 million. In addition, the Company 
had  the  ability,  from  time  to  time,  to  increase  the  size  of  the  Revolving  Credit  Facility  and  the  Term  Loan  by  up  to  an 
additional $150.0 million, in the aggregate, in each case in minimum increments of $25.0 million, subject to certain conditions 
and  the  agreement  of  participating  lenders.  For  the  Term  Loan,  the  Company  was  required  to  make  quarterly  principal 
payments of $1.6 million through March 31, 2018 and $3.1 million from June 30, 2018 through December 31, 2020 with the 
remaining balance due on March 4, 2021. 

On October 13, 2017, the Company amended the Credit Agreement to increase the Revolving Credit Facility from $575.0 
million to $700.0 million and increase the Term Loan from $125.0 million to $200.0 million and to extend the expiration date 
from March 4, 2021 to October 13, 2022. The Credit Agreement also includes the option for the Company to increase the 
size of the Revolving Credit Facility and the Term Loan by up to an additional $300.0 million, in the aggregate, subject to 
the satisfaction of certain conditions set forth in the Credit Agreement. Term Loans may be made in up to two advances. The 
first advance of $125.0 million occurred on October 13, 2017 and the second advance of $75.0 million occurred on January 
16, 2018. For the Term Loan, the Company is required to make quarterly principal payments of 1.25% of the original term 
loan ($1.6 million as of December 30, 2017 increasing to $2.5 million with the second advance on January 16, 2018) through 
maturity, with the remaining balance due on October 13, 2022.  

Outstanding  borrowings  under  the  Credit  Agreement  bear  interest,  at  the  Company’s  option,  at  either  LIBOR,  fixed  for 
interest periods of one, two, three or six-month periods, plus 1.00% to 2.00%, or at the bank’s Base Rate, as defined, plus 
0.00% to 1.00%, based upon the Company’s Consolidated Leverage Ratio, as defined. The Company is also required to pay 
commitment  fees  on  unused  portions  of  the  credit  agreement  ranging  from  0.15%  to  0.25%,  based  on  the  Consolidated 
Leverage Ratio, as defined. The credit agreement includes representations, covenants and events of default that are customary 
for financing transactions of this nature. The effective interest rate on outstanding borrowings under the credit facility was 
3.07% at December 30, 2017. 

As of December 30, 2017, the Company had $0.1 million outstanding in letters of credit and had available $699.9 million of 
borrowing capacity under the Revolving Credit Facility. At December 30, 2017, the Company was in compliance with all 
covenants under the Credit Agreement. 

Senior Notes 

On December 8, 2016, the Company entered into a Note Purchase Agreement, pursuant to which the Company issued and 
sold €212 million aggregate principal amount of senior notes in two series. The funding date for the Euro denominated senior 
notes occurred on December 8, 2016 for €117 million in aggregate amount of 1.14% Senior Notes, Series A, due December 
8, 2023 (“Euro Senior Notes, Series A due 2023”), and €95 million in aggregate amount of 1.83% Senior Notes, Series B due 
December 8, 2028 (“Euro Senior Notes, Series B due 2028”) (together, the “Euro Senior Notes”). Interest on the Euro Senior 
Notes is payable semiannually on June 8 and December 8, commencing June 8, 2017. 

On December 8, 2016, the Company entered into a Note Purchase Agreement, pursuant to which the Company issued and 
sold $125 million aggregate principal amount of senior notes in two series. On February 15, 2017, $25 million in aggregate 
principal amount of 3.03% Senior Notes, Series A, due February 15, 2022 (“U.S. Senior Notes, Series A due 2022”), and 
$100 million in aggregate principal amount of 3.74% Senior Notes, Series B, due February 15, 2027 (“U.S. Senior Notes, 
Series B due 2027”) (together, the “U.S. Senior Notes due 2022 and 2027”) were funded. Interest on the U.S. Senior Notes 
due 2022 and 2027 is payable semiannually on February 15 and August 15, commencing August 15, 2017. 

On November 15, 2017, the Company entered into a Note Purchase Agreement pursuant to which the Company issued and 
sold $175 million in aggregate principal amount of senior notes in two series. On January 16, 2018, $50 million aggregate 
principal amount of 3.48% Senior Notes, Series A, due February 15, 2025 (“U.S. Senior Notes, Series A due 2025”) and 
$125 million in aggregate principal amount of 3.78% Senior Notes, Series B, due February 15, 2030 (“U.S. Senior Notes, 
Series A due 2030”) (together the “U.S. Senior Notes due 2025 and 2030” and with the Euro Senior Notes and the U.S. Senior 
Notes 2022 and 2027, the “Senior Notes”) were funded. Interest on the U.S. Senior Notes due 2025 and 2030 will be payable 
on February 15 and August 15, commencing on August 15, 2018. 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

The Senior Notes have not been registered under the Securities Act, or applicable state securities laws. The Senior Notes are 
general unsecured senior obligations and rank equal in right of payment with all existing and future unsecured unsubordinated 
indebtedness of the Company.  

The Senior Notes are subject to certain customary covenants, including limitations on the Company’s ability, with certain 
exceptions, to engage in mergers, consolidations, asset sales and transactions with affiliates, to engage in any business that 
would substantially change the general business of the Company, and to incur liens. In addition, the Company is required to 
satisfy certain financial covenants and tests relating to, among other matters, interest coverage and leverage. At December 
30, 2017, the Company was in compliance with all covenants under the Senior Notes. 

The Company may redeem the Senior Notes upon the satisfaction of certain conditions and the payment of a make-whole 
amount to noteholders, and are required to offer to repurchase the Senior Notes at par following certain events, including a 
change of control.  

Debt Issuance Costs 

The Company incurred debt issuance costs of $1.6 million in relation to the Credit Agreement which, along with the remaining 
balance of debt issuance costs of the previous credit facility, are being amortized over the life of the Credit Agreement. The 
Company additionally incurred aggregate debt issuance costs of $2.6 million in relation to the Senior Notes which are being 
amortized over the respective lives of the Series A and B notes.  

Entrusted Loan 

During 2014, the Company entered into an entrusted loan arrangement (“Entrusted Loan”) of Chinese renminbi 110.0 million 
(approximately U.S. $17.9 million) between two of its China legal entities, Littelfuse Semiconductor (“Wuxi”) Company (the 
“lender”) and Suzhou Littelfuse OVS Ltd. (the “borrower”), utilizing Bank of America, N.A., Shanghai Branch as agent. 
Direct borrowing and lending between two commonly owned commercial entities was strictly forbidden at the time under 
China’s regulations requiring the use of a third-party agent to enable loans between Chinese legal entities. As a result, the 
Entrusted Loan is reflected as both a long-term asset and long-term debt on the Company’s Consolidated Balance Sheets and 
is reflected in the investing and financing activities in its Consolidated Statements of Cash Flows. Interest expense and interest 
income will be recorded between the lender and borrower with no net impact on the Company’s Consolidated Statements of 
Income since the amounts will be offsetting. The loan interest rate per annum is 5.25%. The Entrusted Loan is used to finance 
the operation and working capital needs of the borrower and matures in November 2019. The balance of the Entrusted Loan 
was paid off as of September 30, 2017. 

Interest paid on all Company debt was approximately $13.4 million, $8.6 million, and $4.1 million in 2017, 2016, and 2015, 
respectively. 

Debt Maturities 

Scheduled maturities of the Company’s long-term debt for each of the five years succeeding December 30, 2017 and 
thereafter are summarized as follows: 

(in thousands) 
2018 ...............................................................................................................................................................   $ 
2019 ...............................................................................................................................................................     
2020 ...............................................................................................................................................................     
2021 ...............................................................................................................................................................     
2022 ...............................................................................................................................................................     
2023 and thereafter ........................................................................................................................................     
  $ 

Scheduled  
Maturities 

6,250   
6,250   
6,250   
6,250   
122,500   
352,992   
500,492   

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

7. Fair Value of Assets and Liabilities 

For assets and liabilities measured at fair value on a recurring and nonrecurring basis, a three-level hierarchy of measurements 
based upon observable and unobservable inputs is used to arrive at fair value. Observable inputs are developed based on 
market  data  obtained  from  independent  sources,  while  unobservable  inputs  reflect  the  Company’s  assumptions  about 
valuation based on the best information available in the circumstances. Depending on the inputs, the Company classifies each 
fair value measurement as follows: 

Level 1—Valuations based on unadjusted quoted prices for identical assets or liabilities in active markets; 

Level  2—Valuations  based  upon  quoted  prices  for  similar  instruments,  prices  for  identical  or  similar  instruments  in 
markets that are not active, or model-derived valuations, all of whose significant inputs are observable, and 

Level 3—Valuations based upon one or more significant unobservable inputs. 

Following is a description of the valuation methodologies used for instruments measured at fair value and their classification 
in the valuation hierarchy. 

Investments 

Investments in equity securities listed on a national market or exchange are valued at the last sales price and classified within 
Level 1 of the valuation hierarchy. Such securities are further detailed in Note 1, Summary of Significant Accounting Policies 
and Other Information. 

Defined Benefit Plan Assets / Non-qualified Supplemental Retirement and Savings Plan Investments 

See Note 8, Benefit Plans for description of valuation methodologies and investment balances for defined benefit plan assets 
and investments related to the Company’s Non-Qualified Supplemental Retirement and Savings Plan. 

The following table presents assets measured at fair value by classification within the fair value hierarchy as of December 
30, 2017: 

Fair Value Measurements Using 

(in thousands) 
Investment in Polytronics .............................................................   $

   Level 1 

     Level 2 

     Level 3 

Total 

10,993    $ 

—    $ 

—    $ 

10,993  

The following table presents assets measured at fair value by classification within the fair value hierarchy as of December 
31, 2016: 

Fair Value Measurements Using 

(in thousands) 
Investment in Polytronics .............................................................   $

   Level 1 

     Level 2 

     Level 3 

Total 

10,435    $ 

—    $ 

—    $ 

10,435  

There were no changes during 2017 to the Company’s valuation techniques used to measure asset and liability fair values on 
a recurring basis. As of December 30, 2017 and December 31, 2016, the Company held no non-financial assets or liabilities 
that are required to be measured at fair value on a recurring basis.  

In addition to the methods and assumptions used for the financial instruments recorded at fair value as discussed above, the 
following methods and assumptions are used to estimate the fair value of other financial instruments that are not marked to 
market  on  a  recurring  basis.  The  Company’s  other  financial  instruments  include  cash  and  cash  equivalents,  short-term 
investments, accounts receivable and its long-term debt. Due to their short-term maturity, the carrying amounts of cash and 
cash equivalents, short-term investments and accounts receivable approximate their fair values. The Company’s revolving 
and term loan debt facilities’ fair values approximate book value at December 30, 2017 and December 31, 2016, as the rates 
on these borrowings are variable in nature. 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

The carrying value and estimated fair values of the Company’s Euro Senior Notes, Series A and Series B and U.S. Senior 
Notes, Series A and Series B, as of December 30, 2017 and December 31, 2016 were as follows: 

2017 

2016 

(in thousands) 
Euro Senior Notes, Series A due 2023 .................................    $ 
Euro Senior Notes, Series B due 2028 .................................      
U.S. Senior Notes, Series A due 2022 ..................................      
U.S. Senior Notes, Series B due 2027 ..................................      

Carrying  
Value 

Estimated 
Fair Value      

Carrying  
Value 

139,623    $ 
113,369      
25,000      
100,000      

138,294    $  122,313     $ 
95,314       
111,579      
25,000       
24,737      
100,000       
99,992      

Estimated 
Fair Value    
122,586  
99,230  
24,746  
98,660  

The fair value as of the measurement date, net book value as of the end of the year and related impairment charge for assets 
measured at fair value on a nonrecurring basis subsequent to initial recognition during the years ended December 31, 2016 
were as follows: 

(in thousands) 
Goodwill ..........................................................................................   $ 
Other intangible assets.....................................................................     
Total ................................................................................................   $ 

Year Ended  
December 31, 2016 

Impairment  
Charge 

Fair Value 
Measurement 
(Level 3) 

As of  
December 31, 
2016 
Net  
Book  
Value 

8,794    $ 
6,015      
14,809    $ 

—    $ 
680      
680    $ 

— 
660 
660 

During the year ended December 31, 2016, the goodwill related to the Custom Products reporting unit was written down to 
its implied fair value of zero. In addition, the company recorded a $6.0 million impairment charge, including $3.8 million 
related to the Custom Products trade name and $2.2 million for the customer relationship intangible assets. After recording 
the impairment charges, there was no remaining value related to the customer relationship intangible assets while $0.7 million 
remaining net book value related to the tradename.  

The company’s accounting and finance management determines the valuation policies and procedures for Level 3 fair value 
measurements and is responsible for the development and determination of unobservable inputs. The following table presents 
the  fair  value,  valuation  techniques  and  related  unobservable  inputs  for  these  Level  3  measurements  for  the  year  ended 
December 31, 2016: 

(in thousands, except rates data)    
Tradename .......................................  $ 

Fair Value 

Valuation 
Technique 

680   Relief from royalty 

Customer relationships ....................  $ 

—  

Excess earnings 

Unobservable 
Inputs 
Discount rate: 
Royalty rate: 

Discount rate: 
Attrition rate: 

Rates 
18% 
1% 

18% 
5% 

8. Benefit Plans 

The  Company  has  Company-sponsored  defined  benefit  pension  plans  covering  employees  in  the  U.K.,  Germany,  the 
Philippines, China, Japan, Mexico, Italy and France. The amount of the retirement benefits provided under the plans is based 
on years of service and final average pay. 

PolySwitch Acquisition 

During 2016, as a result of the PolySwitch acquisition, past service liabilities were assumed by the Company in mainland 
China, France, Germany, Japan, Mexico, and Taiwan (China), together with a small amount of plan assets in Taiwan (China). 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

Littelfuse Inc. Retirement Plan Termination 

The company received approval from the IRS on April 14, 2015 on its Application for Determination for Terminating Plan 
to  terminate  the  U.S.  defined  benefit  pension  plan,  the  Littelfuse  Inc.  Retirement  Plan,  effective  July  30,  2014.  All  plan 
liabilities were settled (either via lump sum payout or purchase of a group annuity contract) in the third quarter of 2015. A 
cash contribution of $9.1 million was made to the U.S. defined benefit plan’s trust in the third quarter of 2015 to fully fund 
the plan on a buyout basis, and the eventual settlement of the plan’s liabilities triggered a settlement charge of $30.2 million 
in the third quarter of 2015. In the fourth quarter of 2015 there was an adjustment to the price of the annuity contract which 
resulted in a refund of premium to the company of $0.3 million. This refund of premium, effectively a re-measurement gain, 
was recognized in the fourth quarter of 2015 as a dollar-for-dollar adjustment to the $30.2 million earnings charge recognized 
in the third quarter of 2015, resulting in a final settlement loss of $29.9 million for the fiscal year ended January 2, 2016.  

During 2016, there were two further adjustments to the price of the annuity contract. Their combined effect resulted in a 
further refund of premium to the company of $0.3 million. This refund of premium was considered additional actual return 
on the assets during 2016, followed by a negative employer contribution of that same amount in the asset reconciliation table 
below. 

Benefit plan related information is as follows for the years 2017 and 2016: 

(in thousands) 
Change in benefit obligation: 
Benefit obligation at beginning of year ...........................................................................   $
Service cost ..................................................................................................................     
Interest cost ..................................................................................................................     
Net actuarial loss (gain) ...............................................................................................     
Benefits paid from the trust .........................................................................................     
Benefits paid directly by the Company ........................................................................     
Curtailments and settlements .......................................................................................     
Acquisitions .................................................................................................................     
Effect of exchange rate movements .............................................................................     
Other ............................................................................................................................     
Benefit obligation at end of year .....................................................................................   $

Change in plan assets at fair value: 
Fair value of plan assets at beginning of year .................................................................   $
Actual return on plan assets .........................................................................................     
Employer contributions ...............................................................................................     
Benefits paid ................................................................................................................     
Acquisitions .................................................................................................................     
Effect of exchange rate movements .............................................................................     
Fair value of plan assets at end of year ............................................................................     
Net amount recognized/(unfunded status)  ......................................................................   $

2017 

2016 

55,606     $
2,037       
1,887       
(433 )     
(1,405 )     
(1,098 )     
(31 )     
—       
5,477       
5,228       
67,268     $

42,208     $
2,962       
264       
(1,405 )     
—       
4,094       
48,123       
(19,145 )   $

50,282  
1,509  
1,662  
10,190  
(2,329) 
250  
(427) 
2,023  
(7,554) 
—  
55,606  

44,629  
6,929  
(126) 
(2,329) 
24  
(6,919) 
42,208  
(13,398) 

Amounts recognized in the Consolidated Balance Sheets as of December 30, 2017 and December 31, 2016 consist of the 
following:  

(in thousands) 
Amounts recognized in the Consolidated Balance Sheets consist of: 
Noncurrent assets ............................................................................................................   $
Current benefit liability ...................................................................................................     
Noncurrent benefit liability .............................................................................................     
Net liability recognized ...................................................................................................   $

2017 

2016 

78     $
(481 )     
(18,742 )     
(19,145 )   $

—  
—  
(13,398) 
(13,398) 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

Amounts recognized in accumulated other comprehensive income (loss), pre-tax as of December 30, 2017 and December 31, 
2016 consist of: 

(in thousands) 
Net actuarial loss  ............................................................................................................   $
Prior service (cost)  .........................................................................................................     
Net amount recognized, pre-tax ......................................................................................   $

2017 

2016 

12,261     $
—       
12,261     $

13,107  
—  
13,107  

The estimated net actuarial loss (gain) which will be amortized from accumulated other comprehensive income (loss) into 
benefit cost in 2018 is approximately $0.3 million. 

The components of pension expense for the years 2017, 2016, and 2015 are as follows:  

(in thousands) 
Components of net periodic benefit cost: 

2017 

2016 

U.S. 

     Foreign 

Total 

2015 

Service cost .......................................................   $
Interest cost .......................................................     
Expected return on plan assets ..........................     
Amortization of losses ......................................     
Net periodic benefit cost ...................................     
Curtailment/Settlement loss (gain)  ..................     
Total expense (income) for the year .................   $

2,037    $
1,887      
(1,990)     
337      
2,271      
(25)     
2,246    $

1,509    $
1,662      
(1,935)     
306      
1,542      
(36)     
1,506    $

750    $ 
3,093      
(2,749)     
870      
1,964      
29,928      
31,892    $ 

824    $
1,735      
(2,346)     
221      
434      
—      
434    $

1,574  
4,828  
(5,095) 
1,091  
2,398  
29,928  
32,326  

Weighted average assumptions used to determine net periodic benefit cost for the years 2017, 2016, and 2015 are as follows: 

Discount rate ...............................................................................     
Expected return on plan assets ....................................................     
Compensation increase rate .........................................................     
Measurement dates ......................................................................    12/31/16        1/2/16 

3.0%    
4.5%    
4.5%    

2017 

2016 

      U.S. 

2015 
      Foreign    
3.9%    
3.7%
6.8%    
5.1%
5.3%
—       
      12/27/14        12/27/14    

3.7 %    
4.9 %    
5.3 %    

The accumulated benefit obligation for the foreign plans was $60.5 million and $51.3 million at December 30, 2017 and 
December 31, 2016, respectively. 

The following table provides a summary of under-funded or unfunded pension benefit plans with projected benefit obligations 
in excess of plan assets as of December 30, 2017 and December 31, 2016: 

(in thousands) 
Projected benefit obligation  ............................................................................................   $
Fair value of plan assets ..................................................................................................     

2017 

2016 

28,515     $
9,292       

48,985  
42,179  

The  following  table  provides  a  summary  of  under-funded  or  unfunded  pension  benefit  plans  with  accumulated  benefit 
obligations in excess of plan assets as of December 30, 2017 and December 31, 2016: 

(in thousands) 
Accumulated benefit obligation  .....................................................................................   $
Fair value of plan assets ..................................................................................................     

2017 

2016 

18,990     $
6,003       

51,306  
38,912  

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

Weighted  average  assumptions  used  to  determine  benefit  obligations  as  of  December  30,  2017,  December  31,  2016  and 
January 2, 2016 are as follows:  

Discount rate .....................................................................................     
Compensation increase rate ...............................................................     
Measurement dates ............................................................................   

2017 

2016 

2015 

3.1%    
5.0%    

2.6 %    
4.5 %    

3.8 %
6.2 %

12/30/17 

12/31/16 

1/2/16 

Expected benefit payments to be paid to participants for the fiscal year ending are as follows: 

(in thousands) 

Expected Benefit 
Payments  

2018 .....................................................................................................................................................   $ 
2019 .....................................................................................................................................................     
2020 .....................................................................................................................................................     
2021 .....................................................................................................................................................     
2022 .....................................................................................................................................................     
2023-2027 ...............................................................................................................................................     

2,467  
2,474  
2,473  
2,802  
2,776  
16,777  

The Company expects to make approximately $1.4 million of contributions to the plans in 2018. 

Defined Benefit Plan Assets 

Based upon analysis of the target asset allocation and historical returns by type of investment, the Company has assumed that 
the expected long-term rate of return will be 4.5% on plan assets. Assets are invested to maximize long-term return taking 
into consideration timing of settlement of the retirement liabilities and liquidity needs for benefits payments. Pension plan 
assets were invested as follows, and were not materially different from the target asset allocation: 

Equity securities ..............................................................................................................      
Debt securities .................................................................................................................      
Cash and equivalents .......................................................................................................      

Asset Allocation 

2017 

2016 

35 %    
64 %    
1 %    
100 %    

32 %
65 %
3 %
100 %

The Company segregated its plan assets by the following major categories and level for determining their fair value as of 
December 30, 2017 and December 31, 2016. All plan assets that are valued using the net asset value per share (“NAV”) 
practical expedient have not been included within the fair value hierarchy but are separately disclosed. 

Cash and cash equivalents – Carrying value approximates fair value. As such these assets were classified as Level 1. The 
Company also invests in certain short-term investments which are valued using the amortized cost method and at NAV. 

Equity – The values of individual equity securities were based on quoted prices in active markets. As such, these assets are 
classified as Level 1. Additionally, the Company invests in certain equity funds that are valued at calculated NAV. 

Fixed income – Fixed income securities are typically priced based on a last trade basis and are exchange-traded. Accordingly, 
the Company classified fixed income securities as Level 1. The Company also invests in certain fixed income funds which 
are valued at NAV. 

For  any  Level  2  plan  assets,  management  reviews  significant  investments  on  a  periodic  basis  including  investigation  of 
unusual fluctuations in price or returns and obtaining an understanding of the pricing methodology to assess the reliability of 
third-party pricing estimates. 

The valuation methodologies described above may generate a fair value calculation that may not be indicative of net realizable 
value or future fair values. While the Company believes the valuation methodologies used are appropriate, the use of different 
methodologies or assumptions in calculating fair value could result in different amounts. The Company invests in various 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

assets in which valuation is determined by NAV. The Company believes that the NAV is representative of fair value at the 
reporting date, as there are no significant restrictions on redemption of these investments or other reasons to indicate that the 
investment would be redeemed at an amount different than the NAV. 

The following table presents the Company’s pension plan assets measured at fair value by classification within the fair value 
hierarchy as of December 30, 2017: 

(in thousands) 
Equities: 

   Fair Value Measurements Using 
     Level 2 
   Level 1 

     Level 3 

NAV 

Total 

Global Equity 50:50 Index Fund  ......................   $ 
Global Equity 50:50 GBP Hedged Fund...........     
Philippine Stock ................................................     

Fixed income: 

Investment Grade Corporate Bond Funds  ........     
Over 15y Gilts Index Fund  ..............................     
Active Corp Bond – Over 10 Yr Fund ..............     
Over 5y Index-Linked Gilts Fund .....................     
Philippine Long Government Securities ...........     
Philippine Long Corporate Bonds ....................     
Cash and equivalents ............................................     
Total pension plan assets ......................................   $ 

—    $ 
—      
1,031      

6,003      
—      
—      
—      
1,362      
723      
173      
9,292    $ 

—    $
—      
—      

—      
—      
—      
—      
—      
—      
—      
—    $

—    $ 
—      
—      

—      
—      
—      
—      
—      
—      
—      
—    $ 

7,898    $
8,134      
—      

—      
3,684      
6,835      
12,049      
—      
—      
231      
38,831    $

7,898  
8,134  
1,031  

6,003  
3,684  
6,835  
12,049  
1,362  
723  
404  
48,123  

The following table presents the Company’s pension plan assets measured at fair value by classification within the fair value 
hierarchy as of December 31, 2016: 

(in thousands) 
Equities: 

   Fair Value Measurements Using 
     Level 2 
   Level 1 

     Level 3 

NAV 

Total 

Global Equity 50:50 Index Fund  ......................   $ 
Global Equity 50:50 GBP Hedged Fund...........     
Philippine Stock ................................................     

Fixed income: 

Investment Grade Corporate Bond Funds  ........     
Over 15y Gilts Index Fund  ..............................     
Active Corp Bond – Over 10 Yr Fund ..............     
Over 5y Index-Linked Gilts Fund .....................     
Philippine Long Government Securities ...........     
Philippine Long Corporate Bonds ....................     
Cash and equivalents ............................................     
Total pension plan assets ......................................   $ 

—    $ 
—      
906      

5,372      
—      
—      
—      
1,133      
751      
476      
8,638    $ 

—    $
—      
—      

—      
—      
—      
—      
—      
—      
—      
—    $

—    $ 
—      
—      

—      
—      
—      
—      
—      
—      
—      
—    $ 

6,321    $
6,406      
—      

—      
3,265      
5,902      
10,724      
—      
—      
952      
33,570    $

6,321  
6,406  
906  

5,372  
3,265  
5,902  
10,724  
1,133  
751  
1,428  
42,208  

Defined Contribution Plan 

The Company also maintains a 401(k) savings plan covering substantially all U.S. employees. The Company matches 100% 
of the employee’s annual contributions for the first 4% of the employee’s eligible compensation. The Company may provide 
an  additional  discretionary  match  to  participants  and  made  discretionary  matches  of  2%  of  the  employee’s  eligible 
compensation  for  each  of  the  years  ended  December  30,  2017,  December  31,  2016  and  January  2,  2016.  Employees  are 
immediately  vested  in  their  contributions  plus  actual  earnings  thereon,  as  well  as  the  Company  contributions.  Company 
matching contributions amounted to $3.5 million, $3.2 million, and $2.8 million in 2017, 2016, and 2015, respectively. 

Non-qualified Supplemental Retirement and Savings Plan 

The Company has a non-qualified Supplemental Retirement and Savings Plan which provides additional retirement benefits 
for certain management employees and named executive officers by allowing participants to defer a portion of their annual 
compensation. The Company maintains accounts for participants through which participants make investment elections. The 

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investments  are  subject  to  the  claims  of  the  Company’s creditors  and  the  Company  is  responsible  for  the payment  of  all 
benefits under the plan from its general assets. As of December 30, 2017, there was $8.0 million of marketable securities 
related to the plan included in Other assets and $8.0 million of accrued compensation included in Other long-term liabilities. 
The marketable securities are classified as Level 1 under the fair value hierarchy as they are maintained in mutual funds with 
readily determinable fair value. The Company made matching contributions to the plan of $0.3 million in 2017. 

9. Shareholders’ Equity 

Equity Plans: The Company has equity-based compensation plans authorizing the granting of stock options, restricted shares, 
restricted share units, performance shares and other stock rights to employees and directors. As of December 30, 2017, there 
were 1.3 million shares available for issuance of future awards under the Company’s equity-based compensation plans.  

Stock options vest over a three, four or five-year period and are exercisable over either a seven or ten-year period commencing 
from the date of the grant. Restricted shares and share units granted by the Company generally vest over three to four years. 

The following table provides a reconciliation of outstanding stock options for the fiscal year ended December 30, 2017. 

Shares 
Under  
Option 

Weighted  
Average 
Price 

Weighted  
Average 
Remaining 
Contract 
Life 
(Years) 

Aggregate 
Intrinsic  
Value  
(000’s) 

Outstanding December 31, 2016 ..................................................     
Granted .....................................................................................     
Exercised ..................................................................................     
Forfeited ....................................................................................     
Outstanding December 30, 2017 ..................................................     
Exercisable December 30, 2017 ...................................................     

356,184    $ 
76,082      
(27,965)     
—    
404,301      
203,745      

98.65      
154.15      
84.93      
NA       
110.04      
92.36      

4.5    $ 
3.6      

35,488  
21,486  

The following table provides a reconciliation of non-vested restricted share and share unit awards for the fiscal year ended 
December 30, 2017. 

Nonvested December 31, 2016........................................................................................     
Granted ........................................................................................................................     
Vested ..........................................................................................................................     
Forfeited .......................................................................................................................     
Nonvested December 30, 2017........................................................................................     

Weighted 
Average  
Grant-Date 
Fair Value 

106.92  
151.91  
102.49  
111.56  
130.40  

Shares 

207,330     $ 
95,621       
(95,520 )     
(7,738 )     
199,693       

The total intrinsic value of options exercised during 2017, 2016, and 2015 was $2.2 million, $13.3 million, and $5.0 million, 
respectively. The total fair value of shares vested was $15.0 million, $10.7 million, and $8.1 million for 2017, 2016, and 
2015, respectively. The total amount of share-based liabilities paid was $0.9 million, $0.6 million and $0.4 million for 2017, 
2016, and 2015, respectively. 

The Company recognizes compensation cost of all share-based awards as an expense on a straight-line basis over the vesting 
period  of  the  awards.  At  December  30,  2017,  the  unrecognized  compensation  cost  for  options,  restricted  shares  and 
performance  shares  was  $15.9  million  before  tax,  and  will  be  recognized  over  a  weighted-average  period  of  1.9  years. 
Compensation cost included as a component of selling, general, and administrative expense for all equity compensation plans 
discussed above was $17.3 million, $12.8 million, and $10.7 million for 2017, 2016, and 2015, respectively. The total income 
tax benefit recognized in the Consolidated Statements of Net Income was $6.0 million, $4.4 million and $3.7 million for 
2017, 2016, and 2015, respectively. 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

The Company uses the Black-Scholes option valuation model to determine the fair value of awards granted. The weighted 
average fair value of and related assumptions for options granted are as follows: 

Weighted average fair value of options granted  ................................     
Assumptions: 

Risk-free interest rate ..................................................................     
Expected dividend yield ..............................................................     
Expected stock price volatility ....................................................     
Expected life of options (years) ..................................................     

2017 
$30.77 

1.79% 
0.86% 
23.0% 
4.4 

2016 
$26.06 

1.37% 
0.97% 
26.0% 
4.6 

2015 
$21.99 

1.25% 
1.04% 
28.0% 
4.6 

Expected volatilities are based on the historical volatility of the Company’s stock price. The expected life of options is based 
on historical data for options granted by the Company. The risk-free rates are based on yields available at the time of grant 
on U.S. Treasury bonds with maturities consistent with the expected life assumption. 

Accumulated Other Comprehensive Income (Loss) (“AOCI”): The following table sets forth the changes in the components 
of AOCI by component for fiscal years 2017, 2016, and 2015:  

(in thousands) 
Balance at December 27, 2014 ...............................................  $ 
2015 activity .......................................................................    
Balance at January 2, 2016 .....................................................    
2016 activity .......................................................................    
Balance at December 31, 2016 ...............................................    
2017 activity .......................................................................    
Balance at December 30, 2017 ...............................................  $ 

(29,615) $ 
20,893     
(8,722)   
(3,261)   
(11,983)   
1,147     
(10,836) $ 

10,791   $ 
793     
11,584     
(815)    
10,769     
(974)    
9,795   $ 

Pension and 
postretirement 
liability and 
reclassification
adjustments (a)    

Gain (Loss) 
on 
investments    

Foreign 
currency 
translation 
adjustments    

Accumulated 
other 
comprehensive 
income (loss)    
(21,126) 
(24,545) 
(45,671) 
(28,908) 
(74,579) 
10,911  
(63,668) 

(2,302 )  $ 
(46,231 )    
(48,533 )    
(24,832 )    
(73,365 )    
10,738      
(62,627 )  $ 

(a) Net of tax of $1.4 million, $1.1 million, and $0.7 million at December 30, 2017; December 31, 2016; and January 2, 2016, 
respectively. 

Preferred Stock: The Board of Directors may authorize the issuance of preferred stock from time to time in one or more series 
with such designations, preferences, qualifications, limitations, restrictions, and optional or other special rights as the Board 
may fix by resolution.  

The Company’s Board of Directors authorized the repurchase of up to 1,000,000 shares of the Company’s common stock 
under a program for the period May 1, 2017 to April 30, 2018. The Company did not repurchase any shares of its common 
stock during fiscal 2017 under the stock repurchase program.  

10. Income Taxes 

On December 22, 2017, the U.S. enacted legislation commonly referred to as the Tax Cuts and Jobs Act (the "Tax Act"). 
Among other things, the Tax Act reduces the U.S. corporate federal income tax rate from 35% to 21%, adds base broadening 
provisions  which  limit  deductions  and  address  excessive  international  tax  planning,  imposes  a  one-time  tax  (the  “Toll 
Charge”)  on  accumulated  earnings  of  certain  non-U.S.  subsidiaries  and  enables  repatriation  of  earnings  of  non-U.S. 
subsidiaries free of U.S. federal income tax. Other than the Toll Charge (which is applicable to the Company for 2017), the 
provisions will generally be applicable to the Company in 2018 and beyond.  

In accordance with the guidance provided in SEC Staff Accounting Bulletin (“SAB”) No. 118, in the fourth quarter of 2017 
the Company recorded a charge of $47 million as a provisional reasonable estimate of the impact of the Tax Act, including 
$49 million for the Toll Charge net of $2 million for other net tax benefits. The Company is continuing to analyze the Tax 
Act and plans to finalize the estimate within the measurement period outlined in SAB No. 118. The final charge may differ 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

from the provisional reasonable estimate if provisions of the Tax Act, and their interaction with other provisions of the U.S. 
Internal Revenue Code, are interpreted differently than interpretations made by the Company in determining the estimate, 
whether  through  issuance  of  administrative  guidance,  or  through  further  review  of  the  Tax  Act  by  the  Company  and  its 
advisors. Aside from these interpretation issues, the final charge may differ from the provisional reasonable estimate due to 
refinements of accumulated non-U.S. earnings and tax pool data. 

One of the base broadening provisions of the Tax Act is commonly referred to as the “GILTI” provisions. In accordance with 
guidance issued by the FASB staff, the Company has not adopted an accounting policy for GILTI. Thus, the U.S. balance 
sheet tax accounts, notably deferred taxes, were computed without consideration of the possible future impact of the GILTI 
provisions. The Company intends to adopt an accounting policy for GILTI within the measurement period outlined in SAB 
118.    

Domestic and foreign income (loss) before income taxes is as follows: 

(in thousands) 
Domestic ............................................................................................   $
Foreign ...............................................................................................     
Income before income taxes ...............................................................   $

2017 

2016 

2015 

(20,496)   $ 
224,533      
204,037    $ 

(9,563)   $
132,837      
123,274    $

1,313   
105,635   
106,948   

Federal, state and foreign income tax expense (benefit) consists of the following: 

(in thousands) 
Current: 

2017 

2016 

2015 

Federal ............................................................................................   $
State ................................................................................................     
Foreign ............................................................................................     
Subtotal ..............................................................................................     
Deferred: 

Federal and State .............................................................................     
Foreign ............................................................................................     
Subtotal ..............................................................................................     
Provision for income taxes .................................................................   $

34,060    $ 
450      
32,945      
67,455      

16,562      
501      
17,063      
84,518    $ 

(3,992)   $
(648)     
28,695      
24,055      

(1,594)     
(3,675)     
(5,269)     
18,786    $

(6,686 ) 
2,078   
19,211   
14,603   

11,330   
149   
11,479   
26,082   

The current federal and state income tax expense for 2017 includes the preliminary estimate of $49 million for the Toll Charge 
as discussed above, partially offset by $13 million of foreign tax credits. The Company will elect to pay the 2017 current 
federal income tax over the eight-year period prescribed by the Tax Act. The long-term portion of the 2017 current federal 
income tax (approximately $32 million) is recorded in the Other long-term liabilities on the Consolidated Balance Sheets as 
of December 30, 2017. 

The current federal tax benefit for 2016 includes an estimated $3 million benefit as a result of the carry-back of the 2016 U.S. 
federal net operating loss to the 2014 tax year. 

The current federal tax benefit for 2015 includes an $11.7 million benefit reclassified from accumulated other comprehensive 
income as a result of the company’s termination of the U.S. defined benefit pension plan as described in Note 8, Benefit 
Plans. 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

A reconciliation between income taxes computed on income before income taxes at the federal statutory rate and the provision 
for income taxes is provided below: 

(in thousands) 
Tax expense at statutory rate of 35% .................................................   $
Provisional amount of the Toll charge ............................................     
Provisional Tax Act impact other than the Toll charge ..................     
State and local taxes, net of federal tax benefit ...............................     
Non-U.S. income tax rate differential .............................................     
Impairment of goodwill without tax benefit ...................................     
Tax on unremitted earnings ............................................................     
Mexico manufacturing operations restructuring .............................     
Nondeductible professional fees .....................................................     
Tax deduction for stock of foreign subsidiary ................................     
Other, net ........................................................................................     
Provision for income taxes .................................................................   $

2017 

2016 

2015 

71,413    $ 
49,000      
(1,962)     
292      
(47,077)     
—      
12,202      
—      
1,240      
—      
(590)     
84,518    $ 

43,146    $
—      
—      
(415)     
(25,471)     
3,088      
2,747      
—      
313      
(3,896)     
(726)     
18,786    $

37,432   
—   
—   
1,907   
(18,253 ) 
—   
—   
4,841   
1,011   
—   
(856 ) 
26,082   

Deferred income taxes are provided for the tax effects of temporary differences between the financial reporting bases and the 
tax bases of the company’s assets and liabilities. Significant components of the company’s deferred tax assets and liabilities 
at December 30, 2017 and December 31, 2016, are as follows: 

(in thousands) 
Deferred tax assets: 

2017 

2016 

Accrued expenses ........................................................................................................   $
Foreign tax credit carryforwards ..................................................................................     
Accrued restructuring ..................................................................................................     
Capital losses ...............................................................................................................     
Domestic and foreign net operating loss carryforwards ..............................................     
Gross deferred tax assets..............................................................................................     
Less: Valuation allowance ...........................................................................................     
Total deferred tax assets ..................................................................................................     

Deferred tax liabilities: 

Tax depreciation and amortization in excess of book ..................................................     
Tax on unremitted earnings .........................................................................................     
Total deferred tax liabilities ............................................................................................     
Net deferred tax (liabilities) assets ..................................................................................   $

24,094     $
1,053       
156       
3,165       
5,778       
34,246       
(6,203 )     
28,043       

21,254       
12,000       
33,254       
(5,211 )   $

31,770  
6,472  
456  
4,557  
2,223  
45,478  
(6,738) 
38,740  

23,471  
1,750  
25,221  
13,519  

The deferred tax asset valuation allowance is related to a U.S. capital loss carryover (which expire in 2018) and tax attributes 
of  certain  non-US  subsidiaries  which  are  not  expected  to  be  realized.  The  remaining  net  operating  losses  either  have  no 
expiration date or are expected to be utilized prior to expiration (which begin expiring in 2021). The Company paid income 
taxes  of  $31.8  million,  $35.6  million,  and $23.3  million  in  2017,  2016, and 2015, respectively,  and received  income  tax 
refunds of $13.7 million in 2017.  

Deferred income taxes are not provided on the excess of the investment value for financial reporting over the tax basis of 
investments  in  those  non-U.S.  subsidiaries  for  which  such  excess  is  considered  to  be  permanently  reinvested  in  those 
operations. As of December 30, 2017, unremitted earnings of the Company’s non-U.S. subsidiaries was approximately $680 
million. The Company recognized deferred tax liabilities of $12.0 million ($11.8 million for non-U.S. taxes and $0.2 million 
for U.S. state taxes) as of December 30, 2017 and $1.8 million as of December 31, 2016, related to taxes on certain non-U.S. 
earnings which are not considered to be permanently reinvested. Some of these taxes may provide a U.S. federal income tax 
benefit as a foreign tax credit. However, due to uncertainty in regard to the Tax Act’s provisions, no such tax benefit was 
recorded. The Company will reconsider this provisional conclusion when it finalizes its preliminary reasonable estimate of 
the impact of the Tax Act, based upon interpretations and administrative guidance as of that time.  

The Company has three subsidiaries in China which benefit from lowered income tax rates due to “tax holidays” which apply 
for three-year periods, subject to extension. One such tax holiday expires in 2018, and the Company expects to be granted an 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

extension. Such tax holidays contributed $5.7 million in tax benefits, or $0.25 per diluted share, during 2017, with similar 
amounts expected in future years while such tax holidays are in effect. 

A reconciliation of the beginning and ending amount of unrecognized tax benefits as of December 30, 2017, December 31, 
2016, and January 2, 2016 is as follows: 

(in thousands, except per share amounts) 
Balance at January 2, 2016 ............................................................................................................................   $ 
Additions for tax positions taken in the current year .................................................................................     
Additions for tax positions taken in the pre-acquisition periods of acquired subsidiaries .........................     
Settlements .................................................................................................................................................     
Balance at December 31, 2016 ......................................................................................................................   $ 
Additions for tax positions taken in the current year .................................................................................     
Other ..........................................................................................................................................................     
Balance at December 30, 2017 ......................................................................................................................   $ 

Unrecognized 
Tax Benefits    
3,532  
2,696  
2,491  
(102) 
8,617  
370  
(1,327) 
7,660  

The company recognizes accrued interest and penalties associated with uncertain tax positions as part of income tax expense. 
The  company  recognized  interest  expense  of  $0.9  million,  $0.9  million,  and  $0.2  million  in  2017,  2016,  and  2015, 
respectively. Accrued interest was $3.3 million, $2.4 million, and $1.5 million as of December 30, 2017, December 31, 2016, 
and January 2, 2016, respectively. 

The amount of unrecognized tax benefits at December 30, 2017 was $7.7 million. This total represents the net amount of tax 
benefits that, if recognized, would favorably affect the effective income tax rate in future periods. The company does not 
expect  any  material  decrease  in  unrecognized  tax  benefits  in  the  next  12  months.  None  of  the  positions  included  in 
unrecognized tax benefits are related to tax positions for which the ultimate deductibility is highly certain, but for which there 
is uncertainty about the timing of such deductibility.  

The U.S. federal statute of limitations remains open for 2014 onward although the company has been audited for 2014 (during 
2016)  and  the  audit  concluded  with  no  additional  tax  due.  In  late  2017,  the  U.S.  Internal  Revenue  Service  began  an 
examination of the Company’s federal income tax returns for 2015 and 2016 (with certain aspects of 2014 also subject to 
review as a consequence of a carryback of tax attributes from 2016). Foreign and U.S. state statute of limitations generally 
range from three to seven years. The German tax authority is currently conducting its examination for tax years 2011 through 
2014. Other non-U.S. tax examinations occur from time to time, including one which is currently in process in Italy. The 
company does not expect to recognize a significant amount of additional tax expense as a result of concluding any of these 
examinations.  

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

11. Earnings Per Share 

The following table sets forth the computation of basic and diluted earnings per share: 

(in thousands, except per share amounts) 
Numerator: 

2017 

2016 

2015 

Net income as reported  ..................................................................   $

119,519    $ 

104,488    $

80,866   

Denominator: 
Weighted average shares outstanding 

Basic ...............................................................................................     
Effect of dilutive securities .............................................................     
Diluted ............................................................................................     

22,687      
244      
22,931      

22,559      
168      
22,727      

22,565   
154   
22,719   

Earnings Per Share: 
Basic earnings per share .....................................................................   $
Diluted earnings per share ..................................................................   $

5.27    $ 
5.21    $ 

4.63    $
4.60    $

3.58   
3.56   

Potential shares of common stock attributable to stock options excluded from the earnings per share calculation because their 
effect would be anti-dilutive were 37,443 shares, 53,448 shares, and 113,130 shares in 2017, 2016, and 2015, respectively.  

On January 17, 2018, the Company acquired IXYS through a combination of cash, Littelfuse common stock, and the value 
of  converted,  or  cash  settled  IXYS  equity  awards.  The  Company  issued  approximately  2.1  million  shares  of  Littelfuse 
common stock and converted IXYS equity awards into approximately 0.5 million Littelfuse equity awards.  

12. Segment Information 

The Company and its subsidiaries design, manufacture and sell components and modules for circuit protection, power control 
and sensing throughout the world. The Company reports its operations by the following segments: Electronics, Automotive, 
and Industrial. An operating segment is defined as a component of an enterprise that engages in business activities from which 
it may earn revenues and incur expenses, and about which separate financial information is regularly evaluated by the Chief 
Operating Decision Maker (“CODM”) in deciding how to allocate resources. The CODM is the Company’s President and 
Chief Executive Officer (“CEO”).  The CODM allocates resources to and assesses the performance of each operating segment 
using information about its revenue and operating income (loss) before interest and taxes, but does not evaluate the operating 
segments using discrete balance sheet information.  

Sales, marketing, and research and development expenses are charged directly into each operating segment. Manufacturing, 
purchasing, logistics, customer service, finance, information technology, and human resources are shared functions that are 
allocated back to the three operating segments.  The Company does not report inter-segment revenue because the operating 
segments do not record it.  Certain expenses, determined by the CODM to be strategic in nature and not directly related to 
segments current results, are not allocated but identified as “Other”.  Additionally, the Company does not allocate interest 
and  other  income,  interest  expense,  or  taxes  to  operating  segments.    These  costs  are  not  allocated  to  the  segments,  as 
management excludes such costs when assessing the performance of the segments.  Although the CODM uses operating 
income  (loss)  to  evaluate  the  segments,  operating  costs  included  in  one  segment  may  benefit  other  segments.  Except  as 
discussed above, the accounting policies for segment reporting are the same as for the Company as a whole. 

   ●  Electronics  Segment:  Consists  of  one  of  the  broadest  product  offerings  in  the  industry,  including  fuses  and  fuse
accessories,  positive  temperature  coefficient  (“PTC”)  resettable  fuses,  polymer  electrostatic  discharge  (“ESD”)
suppressors,  varistors,  gas  discharge  tubes;  semiconductor  and  power  semiconductor  products  such  as  discrete
transient voltage suppressor (“TVS”) diodes, TVS diode arrays, protection and switching thyristors, silicon carbide,
metal-oxide-semiconductor  field-effect  transistors  (“MOSFETs”)  and  silicon  carbide  diodes;  and  insulated  gate
bipolar transistors (“IGBT”) technologies. The segment covers a broad range of end markets, including consumer
electronics, automotive electronics, IT and telecommunications equipment, medical devices, lighting products, and 
white goods. 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

   ●  Automotive  Segment:  Consists  of  a  wide  range  of  circuit  protection,  power  control  and  sensing  technologies  for
global  original  equipment  manufacturers  (“OEMs”),  Tier-I  suppliers  and  parts  distributors  in  the  automotive, 
commercial  vehicle,  and  agricultural  and  construction  equipment  industries.  Passenger  car  fuse products  include
fuses and fuse accessories, including blade fuses, battery cable protectors, varistors, high-current fuses, and high-
voltage  fuses  for  hybrid  and  electric  vehicles.  Commercial  vehicle  products  include  fuses,  switches,  relays,  and
power distribution modules for the commercial vehicle industry. Automotive sensor products include a wide range
of  automotive  and  commercial  vehicle  sensors  designed  to  monitor  the  passenger  compartment  occupants  and
environment as well as the vehicle’s powertrain, emissions, speed and suspension.  

   ● 

Industrial Segment: Consists of power fuses, protection relays and controls and other circuit protection products for 
use  in  heavy  industrial  applications  such  as  mining,  oil  and  gas,  energy  storage,  construction,  HVAC  systems,
elevator and other industrial equipment. 

The Company has provided this segment information for all comparable prior periods. Segment information is summarized 
as follows:  

(in thousands) 
Net sales 

2017 

2016 

2015 

Electronics ......................................................................................   $
Automotive .....................................................................................     
Industrial .........................................................................................     
Total net sales .....................................................................................   $

661,928    $ 
453,227      
106,379      
1,221,534    $ 

535,191    $
415,200      
105,768      
1,056,159    $

405,497   
339,957   
122,410   
867,864   

Depreciation and amortization 

Electronics ......................................................................................   $
Automotive .....................................................................................     
Industrial .........................................................................................     
Total depreciation and amortization ...................................................   $

35,215    $ 
22,459      
5,337      
63,011    $ 

29,141    $
18,107      
5,889      
53,137    $

Operating income (loss) 

Electronics ......................................................................................   $
Automotive .....................................................................................     
Industrial .........................................................................................     
Other(a) ............................................................................................     
Total operating income .......................................................................     
Interest expense ..................................................................................     
Foreign exchange loss (gain)  .............................................................     
Other (income) expense, net ...............................................................     
Income before income taxes ...............................................................   $

155,880    $ 
62,571      
10,334      
(10,274)     
218,511      
13,380      
2,376      
(1,282)     
204,037    $ 

117,088    $
59,905      
3,615      
(49,964)     
130,644      
8,628      
472      
(1,730)     
123,274    $

22,936   
13,437   
5,268   
41,641   

78,194   
53,086   
18,094   
(45,217 ) 
104,157   
4,091   
(1,465 ) 
(5,417 ) 
106,948   

(a) Included in “Other” Operating income (loss) for 2017 are costs related to the acquisition and integration costs associated 
with the Company’s completed and pending acquisitions ($8.0 million in Cost of sales (“COS”) and Selling, general, and 
administrative expenses (“SG&A”) and charges related to restructuring and production transfers in the Company’s Asia 
operations ($2.2 million in SG&A). 

Included in “Other” Operating income (loss) for 2016 are costs related to the impairment of the Custom Products reporting 
unit ($14.8 million), acquisition and integration costs associated with the Company’s 2016 acquisitions ($29.2 million in 
COS and SG&A), transfer of the Company’s reed switch manufacturing operations from its Lake Mills, Wisconsin and 
Suzhou, China locations to the Philippines ($1.6 million in COS), impairment and severance costs related to the closure 
of the Company’s manufacturing facility in Denmark ($1.9 million in SG&A), and restructuring costs ($2.5 million in 
SG&A and Research and development expenses). 

Included  in  “Other”  Operating  income  (loss)  for  2015  are  costs  related  to  the  transfer  of  the  Company’s  reed  switch 
manufacturing operations from its Lake Mills, Wisconsin and Suzhou, China locations to the Philippines ($5.2 million in 
COS), acquisition related fees ($4.6 million included in SG&A), pension settlement and other costs ($31.9 million in 
SG&A), and restructuring costs ($3.6 million in SG&A). 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

The Company’s significant net sales, long-lived assets and additions to long-lived assets by country for the fiscal years ended 
2017, 2016, and 2015 are as follows: 

(in thousands) 
Net sales 

2017 

2016 

2015 

United States ...................................................................................   $
China ...............................................................................................     
Other countries................................................................................     
Total net sales .....................................................................................   $

383,025    $ 
321,111      
517,398      
1,221,534    $ 

356,674    $
263,701      
435,784      
1,056,159    $

Long-lived assets 

United States ...................................................................................   $
China ...............................................................................................     
Mexico ............................................................................................     
Philippines ......................................................................................     
Other countries................................................................................     
Total long-lived assets ........................................................................   $

Additions to long-lived assets 

United States ...................................................................................   $
China ...............................................................................................     
Mexico ............................................................................................     
Philippines ......................................................................................     
Other countries................................................................................     
Total additions to long-lived assets ....................................................   $

23,490    $ 
86,310      
62,510      
31,129      
47,138      
250,577    $ 

3,518    $ 
32,775      
19,395      
2,979      
7,258      
65,925    $ 

23,731    $
65,345      
52,262      
33,345      
42,492      
217,175    $

4,694    $
13,181      
15,667      
5,096      
7,590      
46,228    $

344,305   
193,792   
329,767   
867,864   

23,965   
37,241   
47,130   
33,525   
20,707   
162,568   

8,609   
9,710   
9,193   
12,620   
3,887   
44,019   

For the year ended December 30, 2017, approximately 69% of the Company’s net sales were to customers outside the United 
States (exports and foreign operations) including 26% to China (including Hong Kong). Sales to Arrow Electronics, Inc., 
which were included in the Electronics, Automotive, and Industrial segments, were 10.6% of consolidated net sales in 2017 
but less than 10% for 2016 and 2015. No other single customer accounted for more than 10% of net sales during the last three 
years. 

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

13. Selected Quarterly Financial Data (Unaudited) 

The quarterly periods for 2017 are for the 13-weeks ended December 30, 2017, September 30, 2017, July 1, 2017, and April 
1, 2017, respectively. The quarterly periods for 2016 are for the 13-weeks ended December 31, 2016, October 1, 2016, July 
2, 2016, and April 2, 2016, respectively. 

(in thousands, except per share data) 

   4Q(a) 

     3Q(b) 

2017 
     2Q(c) 

     1Q(d) 

     4Q(e) 

3Q(f) 

2016 
     2Q(g) 

     1Q(h) 

Net sales ........................    $ 304,849    $ 317,889    $ 313,355    $ 285,441    $ 284,518    $ 280,331    $ 271,912    $ 219,398  
Gross profit ....................       126,624       133,651       132,608       113,650       114,337       113,759       97,866       87,155  
Operating income ..........       50,780       58,609       60,270       48,852       40,988       27,526       29,702       32,428  
Net income/(loss) ..........       (10,819)      42,808       48,638       38,891       27,245       30,802       27,152       19,289  
Net income/(loss per 

share 
Basic ..........................    $ 
Diluted .......................    $ 

(0.48)   $
(0.48)   $

1.88    $
1.87    $

2.13    $ 
2.11    $ 

1.71    $
1.69    $

1.20    $
1.19    $

1.36    $ 
1.35    $ 

1.21    $
1.20    $

0.86  
0.85  

(a)  In the fourth quarter of 2017, the Company recorded an estimated one-time tax charge of $49 million for the enactment 
of the Tax Cuts and Jobs Act for deemed repatriation of unremitted earnings of foreign subsidiaries, $1.4 million in 
acquisition and integration costs and $0.7 million in restructuring and production costs related to the transfer of Asian 
operations. 

(b)  In the third quarter of 2017, the Company recorded $4.8 million in acquisition and integration costs and $1.5 million in 

restructuring and production costs related to the transfer of Asian operations. 

(c)   In the second quarter of 2017, the Company recorded $0.3 million in acquisition and integration costs.  

(d)  In the first quarter of 2017, the Company $1.5 million in acquisition and integration costs 

(e)  In the fourth quarter of 2016, the Company recorded ($0.1) million gain related to the Company’s transfer of its reed
sensor manufacturing operations from the U.S. and China to the Philippines, $1.2 million of restructuring costs, $3.2
million  in  acquisition  and  integration  costs  and  $0.3  million  in  non-cash  inventory  charges  related  to  the  2016
acquisitions. 

(f)  In the third quarter of 2016, the Company recorded $0.9 million of restructuring costs, $5.9 million in acquisition and 
integration costs, $14.8 million of charges related to the impairment of the Custom Products reporting unit and $0.5
million in non-cash inventory charges as noted above. 

(g)  In the second quarter of 2016, the Company recorded $0.7 million related to the reed sensor manufacturing transfer as
noted above, $0.1 million of restructuring costs, $6.1 million in acquisition and integration costs, $0.3 million in charges 
related to the closure of the manufacturing facility in Denmark and $6.9 million in non-cash inventory charges as noted
above. 

(h)  In the first quarter of 2016, the Company recorded $1.0 million related to the reed sensor manufacturing transfer as noted
above, $0.4 million of restructuring costs, $6.2 million in acquisition and integration costs, and $1.6 million in charges 
related to the closure of the manufacturing facility in Denmark. 

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ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL 
DISCLOSURE. 

None. 

ITEM 9A. CONTROLS AND PROCEDURES. 

Evaluation of Disclosure Controls and Procedures 

The  Company  maintains  disclosure  controls  and  procedures  that  are  designed  to  ensure  that  information  required  to  be 
disclosed in its reports filed under the Securities Exchange Act of 1934, as amended, is recorded, processed, summarized and 
reported  within  the  time  periods  specified  in  the  SEC’s  rules  and  forms  and  that  such  information  is  accumulated  and 
communicated to management, including the Company’s Chief Executive Officer and Chief Financial Officer, as appropriate, 
to  allow  for  timely  decisions  regarding  required  disclosure.  In  designing  and  evaluating  the  disclosure  controls  and 
procedures, the Company recognizes that any controls and procedures, no matter how well designed and operated, can provide 
only reasonable assurance of achieving the desired control objectives, and the Company is required to apply its judgment in 
evaluating the cost-benefit relationship of possible controls and procedures. 

As required by SEC Rule 15d-15(b), the Company carried out an evaluation, under the supervision and with the participation 
of its management, including the Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and 
operation of its disclosure controls and procedures pursuant to SEC Rule 13a-15 as of the end of the period covered by this 
report.  Based  on  the  foregoing,  the  Company’s  Chief  Executive  Officer  and  Chief  Financial  Officer  concluded  that  the 
Company’s disclosure controls and procedures were effective as of December 30, 2017. 

Management’s Report on Internal Control over Financial Reporting 

Section 404 of the Sarbanes-Oxley Act of 2002 requires management to include in this Annual Report on Form 10-K a report 
on management’s assessment of the effectiveness of the Company’s internal control over financial reporting, as well as an 
attestation report from the Company’s independent registered public accounting firm on the effectiveness of the Company’s 
internal  control  over  financial  reporting.  Management  is  responsible  for  establishing  and  maintaining  adequate  internal 
control  over  financial  reporting  as  such  term  is  defined  in  Exchange  Act  Rule  13a-15(f)  and  15d-15(f).  The  Company’s 
internal control system was designed to provide reasonable assurance to its management and the Board of Directors regarding 
the preparation and fair presentation of published financial statements.  

All  internal  control  systems,  no  matter  how  well  designed,  have  inherent  limitations.  Therefore,  even  those  systems 
determined effective can provide only reasonable assurance with respect to financial statement preparation and presentation. 
A material weakness is a deficiency, or a combination of deficiencies, in the internal control over financial reporting such 
that there is a reasonable possibility that a material  misstatement of the annual or interim financial statement will not be 
prevented or detected on a timely basis. 

The  Company’s  management,  including  the  its  Principal  Executive  Officer  and  Principal  Financial  Officer,  assessed  the 
effectiveness of the Company’s internal control over financial reporting as of December 30, 2017, based upon the updated 
framework  in  Internal  Control  —  Integrated  Framework  issued  by  the  Committee  of  Sponsoring  Organizations  of  the 
Treadway Commission (“COSO”) in 1992 and updated in May 2013. Based on this assessment, the Company’s management 
concluded that, as of December 30, 2017, the Company’s internal control over financial reporting was effective. 

Changes in Internal Control over Financial Reporting  

There has been no change in the Company’s internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-
15(f)  under  the  Exchange  Act)  that  occurred  during  the  12  months  or  fiscal  quarter  ended  December  30,  2017,  that  has 
materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.  

ITEM 9B. OTHER INFORMATION. 

None. 

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PART III 

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS, AND CORPORATE GOVERNANCE. 

Except as set forth below, the information required by this item will be contained in the Company’s 2017 Proxy Statement 
and is incorporated herein by reference. 

Information  concerning  directors  and  nominees  for  director  is  set  forth  in  the  section  titled  “Proposal  No.  1  Election  of 
Directors” in the Company’s proxy statement and is incorporated herein by reference. 

Information concerning the Company’s Audit Committee and Audit Committee financial expert is set forth in the section 
titled “Director Independence; Financial Experts” in its proxy statement and is incorporated herein by reference. 

Information concerning the procedures by which security holders may recommend nominees to the Company’s Board of 
Directors is set forth in the section titled “Director Candidates” in the Company’s proxy statement and is incorporated herein 
by reference. 

Information concerning compliance with Section 16 of the Securities Exchange Act of 1934 is set forth in the section titled 
“Section 16(a) Beneficial Ownership Reporting Compliance” in the Company’s proxy statement and is incorporated herein 
by reference. 

Executive Officers of the Registrant. 

The executive officers of the Company are as follows: 

Name 
David W. Heinzmann 
Meenal A. Sethna 
Ryan K. Stafford 

Matthew J. Cole 
Ian Highley 

Deepak Nayar 
Michael P. Rutz 

Age 
54 
48 
50 

46 
54 

58 
46 

Position 
President and Chief Executive Officer 
Executive Vice President and Chief Financial Officer 
Executive Vice President, Chief Legal and Human Resources Officer and  
Corporate Secretary 
Senior Vice President and General Manager, Industrial Business Unit 
Senior Vice President and General Manager, Semiconductor Products and Chief 
Technology Officer 
Senior Vice President and General Manager, Electronics Business Unit 
Senior Vice President, Global Operations 

David W. Heinzmann has served as the President and Chief Executive Officer and a member of the Board of Directors since 
January 2017. He previously served as the Company’s Chief Operating Officer, since 2014. Mr. Heinzmann began his career 
at Littelfuse in 1985 as a manufacturing engineer and has held positions of increasing responsibility since that time. From 
2004 through 2007, he served as Vice President and General Manager, Automotive segment, and then as Vice President, 
Global Operations until 2014. Mr. Heinzmann has served on the board of directors of Pulse Electronics Corporation, since 
2014. Mr. Heinzmann holds a BS in mechanical engineering from Missouri University of Science and Technology. 

Meenal A. Sethna, Executive Vice President and Chief Financial Officer since March, 2016, leads the company’s finance, 
accounting, internal audit, investor relations and information technology functions. Ms. Sethna joined the company in 2015 
as Senior Vice President of Finance. Prior to joining Littelfuse, Ms. Sethna spent four years at Illinois Tool Works Inc. as 
Vice President and Corporate Controller. Previous to that, she worked at Motorola Inc., most recently as Vice President, 
Finance. She began her career at Baxter International, holding a variety of finance roles during her tenure. Ms. Sethna is a 
graduate of the Kellogg School of Management at Northwestern University and the University of Illinois-Urbana, and is a 
Certified Public Accountant in Illinois. 

Ryan K. Stafford, Executive Vice President, Chief Legal and Human Resources Officer and Corporate Secretary, leads the 
company’s legal, compliance, human resources and corporate marketing and communications functions. Mr. Stafford joined 
the company’s executive team as its first general counsel in January 2007. Prior to joining the company, Mr. Stafford served 
in a number of roles at Tyco International Ltd., including Vice President of China Operations and Vice President & General 
Counsel for its Engineered Products & Services Business Segment. Prior to that he was with the law firm Sulloway & Hollis 
P.L.L.C. 

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Matthew J. Cole, Senior Vice President and General Manager, Industrial Business Unit, joined Littelfuse in July 2015 and 
is responsible for the electrical fuse, protection relay and custom electrical products businesses. Mr. Cole has more than 20 
years of experience in general management, strategy development, mergers and acquisitions, and operations. Prior to joining 
Littelfuse, he was Vice President and General Manager of AMETEK’s Advanced Measurement Technology division, a global 
leader in electronic instruments and electromechanical devices. His career also includes positions in general management, 
marketing and operations at Danaher and Allied Signal/Honeywell. 

Ian  Highley,  Senior  Vice  President  and  General  Manager,  Semiconductor  Products  and  Chief  Technology  Officer,  is 
responsible for the marketing, sales, product development and strategic planning efforts of the company’s semiconductor 
products in addition to being responsible for the company’s overall R&D and technology efforts. Mr. Highley joined the 
company in 2002 as Product Line Director, Semiconductor Products. Mr. Highley served as General Manager Semiconductor 
Products from August 2008 to May 2012 and Vice President and General Manager, Semiconductor Products from May 2012 
to January 2015. Mr. Highley was promoted to his current position in January 2015. 

Deepak Nayar, Senior Vice President and General Manager, Electronics Business Unit, is responsible for marketing, sales, 
product development and customer relationships of the Electronics Business Unit. Mr. Nayar joined the company in 2005 as 
Business Line Director of the Electronics Business Unit. In July 2007, Mr. Nayar was promoted to Vice President, Global 
Sales, Electronics Business Unit, before he was promoted to his current position in 2011. Prior to joining the company, Mr. 
Nayar served as Worldwide Sales Director of Tyco Electronics Power Components Division from 1999 to 2005. Before that, 
Mr. Nayar served as Director of Business Development, Raychem Electronics OEM Group from 1997 to 1999. 

Michael P. Rutz, Senior Vice President, Global Operations, is responsible for the company’s sourcing, supplier development, 
supply chain, quality and manufacturing engineering services. From February 2014 to January 2015, Mr. Rutz was Vice 
President  of  Supply  Chain  and Operational  Excellence.  From  August  2011  to  February  2014,  Mr.  Rutz was  Senior  Vice 
President Global Supply Chain at WMS Industries Inc., a Chicago-based manufacturer of equipment and software for the 
gaming industry.  Prior to that, Mr. Rutz served for 16 years in various positions of increasing responsibility, at Motorola 
Solutions, Inc., most recently as Vice President of Networks Supply Chain from 2009 until August 2011. 

Code of Ethics  

The company has adopted a Code of Conduct (Code of Ethics) that applies to all of the Company’s employees including the 
Company’s Principal Executive Officer, Principal Financial Officer, Principal Accounting Officer and persons performing 
similar functions. It has posted the text of the Code of Conduct on its website at http://investor.littelfuse.com/governance.cfm 
and intends to disclose on such website any amendments to, or waivers from the Code of Conduct. The company’s website 
is not incorporated by reference into this Annual Report. 

ITEM 11. EXECUTIVE COMPENSATION. 

Information concerning compensation of the Company’s executive officers and directors for the year ended December 30, 
2017,  is  set  forth  in  the  sections  titled  “Compensation  Discussion  &  Analysis,”  “Compensation  Tables”  and  “Director 
Compensation”  in  the  Company’s  proxy  statement  and  is  incorporated  herein  by  reference,  except  the  section  titled 
“Compensation Committee Report” is hereby “furnished” and not “filed” with this Annual Report on Form 10-K. 

Information  concerning  compensation  committee  interlocks  is  set  forth  in  the  section  titled  “Compensation  Committee 
Interlocks and Insider Participation” in the Company’s proxy statement and is incorporated herein by reference. 

ITEM  12.  SECURITY  OWNERSHIP  OF  CERTAIN  BENEFICIAL  OWNERS  AND  MANAGEMENT  AND 
RELATED STOCKHOLDER MATTERS. 

Information concerning the security ownership of certain beneficial owners, the Company’s directors and executive officers 
as of March 1, 2018, is set forth in the section titled “Ownership of Littelfuse, Inc. Common Stock” in the Company’s proxy 
statement and is incorporated herein by reference.  

Information  concerning  the  Company’s  equity  compensation  plan  is  set  forth  in  the  section  titled  “Compensation  Plan 
Information” in the Company’s proxy statement and is incorporated herein by reference. 

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ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE. 

Information concerning the independence of the Company’s directors, certain relationships and related transactions during 
2017 and the Company’s policies with respect to such transactions is set forth in the sections titled “Proposal No. 1 Election 
of Directors” and “Certain Relationships and Related Transactions” in the Company’s proxy statement and is incorporated 
herein by reference. 

ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES. 

Information concerning principal accountant fees and services is set forth in the section titled “Audit Related Matters” in the 
Company’s proxy statement and is incorporated herein by reference. 

PART IV 

ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES.  

(a)  Financial Statements and Schedules 

(1)  The following Financial Statements are filed as a part of this report: 

Reports of Independent Registered Public Accounting Firms (pages 35-36).  

(i) 
(ii)  Consolidated Balance Sheets as of December 30, 2017 and December 31, 2016 (page 37). 
(iii)  Consolidated Statements  of Net  Income  for  the  years  ended  December  30, 2017, December 31,  2016  and

January 2, 2016 (page 38). 

(iv)  Consolidated Statements of Comprehensive Income for the years ended December 30, 2017, December 31,

2016 and January 2, 2016 (page 38). 

(v)  Consolidated Statements  of Cash  Flows for  the  years  ended  December  30, 2017, December  31,  2016  and 

January 2, 2016 (page 39). 

(vi)  Consolidated Statements of Equity for the years ended December 30, 2017, December 31, 2016 and January

2, 2016 (page 40). 

(vii)  Notes to Consolidated Financial Statements (pages 41-73). 

(2)  The following Financial Statement Schedule is submitted herewith for the periods indicated therein. 

(i) 

Schedule II - Valuation and Qualifying Accounts and Reserves (page 78). 

All other schedules for which provision is made in the applicable accounting regulations of the Securities and Exchange 
Commission are not required under the related instructions or are inapplicable and, therefore, have been omitted. 

(3)  Exhibits. See Exhibit Index on pages 80-86. 

Item 16. FORM 10-K SUMMARY 

None. 

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SCHEDULE II 

VALUATION AND QUALIFYING ACCOUNTS AND RESERVES 

Description 

(in thousands) 
Year ended December 30, 2017 

Balance at 
Beginning 
of Year 

Charged to 
Costs and 
Expenses 
(a) 

Deductions 
(b) 

Other (c)      

Balance at 
End  
of Year 

Allowance for losses on accounts receivable ..   $ 
Reserves for sales discounts and allowances ..   $ 
Deferred tax valuation allowance ....................   $ 

2,079    $
23,825    $
6,738    $

3,068    $ 

(4,070)   $ 
106,781    $  (104,941)   $ 
—    $ 

—    $ 

95    $ 
679    $ 
(535)   $ 

1,172  
26,344  
6,203  

Year ended December 31, 2016 

Allowance for losses on accounts receivable ..   $ 
Reserves for sales discounts and allowances ..   $ 
Deferred tax valuation allowance ....................   $ 

319    $
17,168    $
4,557    $

1,769    $ 
91,632    $ 
—    $ 

(42)   $ 
(90,837)   $ 
—    $ 

33    $ 
5,862    $ 
2,181    $ 

2,079  
23,825  
6,738  

Year ended January 2, 2016 

Allowance for losses on accounts receivable ..   $ 
Reserves for sales discounts and allowances ..   $ 
Deferred tax valuation allowance ....................   $ 

278    $
19,140    $
4,557    $

164    $ 
81,335    $ 
—    $ 

150    $ 
82,997    $ 
—    $ 

27    $ 
(310)   $ 
—    $ 

319  
17,168  
4,557  

(a)  Includes provision for doubtful accounts, sales returns and sales discounts granted to customers. 
(b)  Represents uncollectible accounts written off, net of recoveries and credits issued to customers and the write-off of 

certain deferred tax assets that previously had full valuation allowances. 

(c)  Represents  business  acquisitions,  U.S.  and  non-U.S.  subsidiary  tax  attributes  and  foreign  currency  translation

adjustments.  

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Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused 
this report to be signed on its behalf by the undersigned, thereunto duly authorized. 

SIGNATURES 

Littelfuse, Inc. 

By:  /s/ David W. Heinzmann 

David W. Heinzmann, 
President and Chief Executive Officer   

Date: February 23, 2018 

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following 
persons on behalf of the registrant on February 23, 2018 and in the capacities indicated. 

/s/ Gordon Hunter 

Gordon Hunter 

/s/ David W. Heinzmann 

David W. Heinzmann 

/s/ Tzau-Jin Chung 

Tzau-Jin Chung 

/s/ Cary T. Fu 

Cary T. Fu 

/s/ Anthony Grillo 

Anthony Grillo 

/s/ John E. Major 

John E. Major 

/s/ William P. Noglows 

William P. Noglows 

/s/ Ronald L. Schubel 

Ronald L. Schubel 

/s/ Nathan Zommer 

Nathan Zommer 

/s/ Meenal A. Sethna 

Meenal A. Sethna 

/s/ Jeffrey G. Gorski 

Jeffrey G. Gorski 

  Chairman of the Board of Directors 

  Director, President and Chief Executive Officer 
  (Principal Executive Officer) 

  Director 

  Director 

  Director 

  Director 

  Director 

  Director 

  Director 

  Executive Vice President and Chief Financial Officer 
  (Principal Financial Officer) 

  Corporate Controller and Chief Accounting Officer 
  (Principal Accounting Officer) 

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The  following  documents  listed  below  that  have  been  previously  filed  with  the  SEC  (1934  Act  File  No.  0-20388)  are 
incorporated herein by reference: 

EXHIBIT INDEX  

Exhibit No.    
2.1+ 

Description 
Stock Purchase Agreement, dated as of April 15, 
2013, by and among Littelfuse, Inc. and Key Safety 
Systems, Inc. 
Stock and Asset Purchase Agreement, dated 
November 7, 2015, by and between Littelfuse, Inc. 
and TE Connectivity Ltd. 

   Agreement and Plan of Merger, dated August 25, 
2017, as amended by Amendment No. 1, dated 
December 4, 2017, by and among IXYS 
Corporation, Littelfuse, Inc., Iron Merger Co., Inc., 
and IXYS Merger Co., LLC. 
Certificate of Incorporation dated November 25, 
1991, as amended April 25, 1997. 
Certificate of Designations of Series A Preferred 
Stock. 
Bylaws, as amended and restated October 24, 2014. 
Form of Non-Qualified Stock Option Agreement 
under the 1993 Stock Plan for Employees and 
Directors of Littelfuse, Inc. for employees.++ 
Form of Non-Qualified Stock Option Agreement 
under the 1993 Stock Plan for Employees and 
Directors of Littelfuse, Inc., for non-employee 
directors. ++ 
Form of Non-Qualified Stock Option Agreement 
under the Littelfuse, Inc. Equity Incentive 
Compensation Plan. ++ 
Form of Non-Qualified Stock Option Agreement 
under the Littelfuse, Inc. Outside Directors Stock 
Option Plan.++ 

2.2+ 

2.3+ 

3.1 

3.2 

3.3 
10.1 

10.2 

10.3 

10.4 

Incorporated by Reference Herein 

Form 
8-K 

Exhibit  Filing Date 
04/15/2013 

2.1 

File No. 
0-20388 

8-K 

2.1 

11/12/2015 

0-20388 

S-4/A  Annex A  12/11/2017 

333-22114 

10-K 

8-K 

10-Q 
8-K 

3.1 

4.2 

02/27/2017 

0-20388 

12/01/1995 

0-20388 

3.1 
99.1 

10/31/2014 
11/12/2004 

0-20388 
0-20388 

10-K 

10.24 

03/17/2005 

0-20388 

8-K 

99.4 

05/11/2006 

0-20388 

8-K 

99.6 

05/11/2006 

0-20388 

10.5 

   Amended and Restated Employment Agreement 

10-K 

10.1 

02/27/2008 

0-20388 

10.6 

10.7 

10.8 

dated as of December 31, 2007, between Littelfuse, 
Inc. and Gordon Hunter .++ 
Littelfuse, Inc. Retirement Plan as Amended and 
Restated, effective January 1, 2008 .++ 
Form of Stock Option Award Agreement under the 
Littelfuse, Inc. Outside Directors' Equity Plan.++ 
Form of Restricted Stock Unit Award Agreement 
under the Littelfuse, Inc. Outside Directors' Equity 
Plan.++ 

10-K 

10.13 

02/27/2008 

0-20388 

8-K 

8-K 

99.3 

05/01/2008 

0-20388 

99.4 

05/01/2008 

0-20388 

10.9 

   Amended and Restated, Littelfuse, Inc. Deferred 

10-K 

10.4 

02/27/2008 

0-20388 

10.10 

10.11 

Compensation Plan for Non-Employee Directors.++ 
Form of Restricted Stock Award Agreement under 
the Littelfuse, Inc. Equity Incentive Compensation 
Plan .++ 
Form of Stock Option Award Agreement under the 
Littelfuse, Inc. Equity Incentive Compensation Plan 
.++ 

8-K 

10.1 

04/28/2009 

0-20388 

8-K 

10.2 

04/28/2009 

0-20388 

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Exhibit No.    
10.12 

10.13 

10.14 

10.15 

10.16 

10.17 

Description 

First Amendment to the Amended and Restated 
Littelfuse, Inc. Retirement Plan, effective March 25, 
2009.++ 
Littelfuse, Inc. Long-Term Incentive Plan, effective 
February 3, 2010.++ 
Form of Restricted Stock Unit Award Agreement 
(Outside Director) under the Littelfuse, Inc. Long-
Term Incentive Plan.++ 
Form of Stock Option Award Agreement under the 
Littelfuse, Inc. Long-Term Incentive Plan.++ 
First Amendment to the Littelfuse, Inc. Long-Term 
Incentive Plan, effective July 27, 2012.++ 
Credit Agreement, dated as of May 31, 2013, among 
Littelfuse, Inc., as borrower, JPMorgan Chase Bank, 
N.A. as Agent, Bank of America, N.A., as 
Syndication Agent, Wells Fargo Bank, National 
Association and PNC Bank, National Association, as 
Co-Documentation Agents, J.P. Morgan Securities 
LLC, as Sole Bookrunner and Joint Lead Arranger, 
and Merrill, Lynch, Pierce, Fenner & Smith 
Incorporated, as Joint Lead Arranger. 

10.18 

10.19 

   Master Increasing Lender Supplement, dated as of 
January 30, 2014, among Littelfuse, Inc., as 
borrower, JPMorgan Chase Bank, N.A. as 
Administrative Agent, and each of the banks, 
financial institutions and other institutional lenders 
listed on the respective signature pages thereof. 
Littelfuse, Inc. Annual Incentive Plan, effective 
January 1, 2014. ++ 

Incorporated by Reference Herein 

Form 
10-K 

Exhibit  Filing Date 
02/26/2010 

10.30 

File No. 
0-20388 

8-K 

10.1 

05/05/2010 

0-20388 

S-8 

4.4 

05/19/2010 

0-20388 

S-8 

4.6 

05/19/2010 

0-20388 

10-K 

10.36 

02/27/2013 

0-20388 

8-K 

10.1 

06/05/2013 

0-20388 

8-K 

10.1 

02/04/2014 

0-20388 

DEF14A 

A 

03/17/2014 

0-20388 

10.20 

   Amended and Restated Employment Agreement, 

10-Q 

10.2 

05/02/2014 

0-20388 

10.21 

10.22 

10.23 

10.24 

10.25 

10.26 

10.27 

effective as of January 1, 2014, between Littelfuse 
Europe GmbH and Dieter Roeder .++ 
Change of Control Agreement effective as of 
February 10, 2014, between Littelfuse, Inc. and 
Michael Rutz.++ 
Termination Amendment to the Littelfuse, Inc. 
Retirement Plan, effective July 31, 2014. ++ 
Change of Control Agreement effective as of 
January 1, 2015, between Littelfuse, Inc. and Gordon 
Hunter.++ 
Change of Control Agreement effective as of 
January 1, 2015, between Littelfuse, Inc. and Philip 
G. Franklin.++ 
Change of Control Agreement effective as of 
January 1, 2015, between Littelfuse, Inc. and Dieter 
Roeder.++ 
Change of Control Agreement effective as of 
January 1, 2015, between Littelfuse, Inc. and Ryan 
K. Stafford.++ 
Change of Control Agreement effective as of 
January 1, 2015, between Littelfuse, Inc. and Ian 
Highley.++ 

10-Q 

10.1 

05/02/2014 

0-20388 

10-Q 

10.1 

10/31/2014 

0-20388 

8-K 

10.1 

12/22/2014 

0-20388 

8-K 

10.2 

12/22/2014 

0-20388 

8-K 

10.4 

12/22/2014 

0-20388 

8-K 

10.5 

12/22/2014 

0-20388 

10-K 

10.11 

02/24/2015 

0-20388 

81 

 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
Exhibit No.    
10.28 

Description 

Change of Control Agreement effective as of 
January 1, 2015, between Littelfuse, Inc. and Deepak 
Nayar.++ 

Incorporated by Reference Herein 

Form 
10-K 

Exhibit  Filing Date 
02/24/2015 

10.12 

File No. 
0-20388 

10.29 

   Amendment No. 1, dated as of May 2, 2014, to 

10-K 

10.47 

02/24/2015 

0-20388 

Credit Agreement, dated as of May 30, 2013, by and 
among Littelfuse, Inc., as borrower, JPMorgan 
Chase Bank, N.A. as Agent, and each of the banks, 
financial institutions listed on the respective 
signature pages thereof.  

   Amendment No. 2, dated as of January 14, 2015, to 
Credit Agreement, dated as of May 31, 2013, by and 
among Littelfuse, Inc., as borrower, JPMorgan 
Chase Bank, N.A. as Agent, and each of the banks, 
financial institutions listed on the respective 
signature pages thereof.  
Form of Restricted Stock Unit Award Agreement 
(Executive) under the Littelfuse, Inc. Long-Term 
Incentive Plan.++ 
Form of Restricted Stock Unit Award Agreement 
(Tier II Management) under the Littelfuse, Inc. 
Long-Term Incentive Plan.++ 

10.30 

10.31 

10.32 

10-K 

10.48 

02/24/2015 

0-20388 

10-Q 

10.2 

07/31/2015 

0-20388 

10-Q 

10.3 

07/31/2015 

0-20388 

10.33 

   Amendment No. 3, dated as of May 4, 2015, to 

10-Q 

10.1 

07/31/2015 

0-20388 

10.34 

10.35 

10.36 

10.37 

10.38 

10.39 

Credit Agreement, dated as of May 31, 2013, by and 
among Littelfuse, Inc., as borrower, JPMorgan 
Chase Bank, N.A., as Agent, and each of the banks, 
financial institutions listed on the respective 
signature pages thereof. 
Change of Control Agreement effective as of 
February 1, 2016, between Littelfuse, Inc. and 
Meenal A. Sethna. ++ 
Change of Control Agreement effective as of May 
26, 2015 between Littelfuse, Inc. and Matt Cole.++ 
Credit Agreement, dated as of March 4, 2016 among 
Littelfuse, Inc. and Certain Subsidiaries as 
borrowers, Guarantors party thereto, Bank of 
America, N.A. as Agent, Swing Line Lender and 
L/C Issuer and JPMorgan Chase Bank, N.A. as 
Syndication Agent, BMO Harris Bank, N.A., PNC 
Bank, National Association and Wells Fargo Bank, 
National Association as Co-Documentation 
Agents, Merril, Lynch, Pierce, Fenner & Smith 
Incorporated, as Sole Bookrunner and Joint Lead 
Arranger and JPMorgan Chase Bank, N.A., as Joint 
Lead Arranger.   
Form of Stock Option Award Agreement 
(Executive) under the Littelfuse, Inc. Long-Term 
Incentive Plan. ++ 
Form of Stock Option Award Agreement (Outside 
Director – 2016 Grant) under the Littelfuse, Inc. 
Long-Term Incentive Plan. ++ 
Form of Restricted Stock Unit Award Agreement 
(Executive) under the Littelfuse, Inc. Long-Term 
Incentive Plan. ++ 

82 

8-K 

10.1 

02/03/2016 

0-20388 

10-K 

10.13 

03/01/2016 

0-20388 

8-K 

10.1 

03/10/2016 

0-20388 

10-Q 

10.3 

05/06/2016 

0-20388 

10-Q 

10.4 

05/06/2016 

0-20388 

10-Q 

10.5 

05/06/2016 

0-20388 

 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
Exhibit No.    
10.40 

10.41 

10.42 

10.43 

10.44 

10.45 

10.46 

10.47 

10.48 

10.49 

10.50 

Description 
Form of Restricted Stock Unit Award Agreement 
(Tier II Management) under the Littelfuse, Inc. 
Long-Term Incentive Plan. ++ 
Form of Restricted Stock Unit Award Agreement 
(Outside Director – 2016 Grant) under the Littelfuse, 
Inc. Long-Term Incentive Plan. ++ 
Form of Restricted Stock Unit Award Agreement 
(Executive) under the Littelfuse Inc. Long-Term 
Incentive Plan. ++ 
Executive Retirement Agreement entered into 
between Littelfuse, Inc. and Gordon Hunter, 
effective January 1, 2017. ++ 
Letter Agreement entered into between Littelfuse, 
Inc. and David W. Heinzmann. Effective January 1, 
2017. ++ 
Change of Control Agreement effective as of 
January 1, 2017, between Littelfuse, Inc. and David 
W. Heinzmann. ++ 
Littelfuse, Inc. 3.03% Senior Note, Series A, due 
February 15, 2022, and 3.74% Senior Note, Series B, 
due February 15, 2027 Note Purchase Agreement. 
Littelfuse, Netherland C.V. 1.14% Senior Note, 
Series A, due December 8, 2023, and 1.83% Senior 
Note, Series B, due December 8, 2028 Note 
Purchase Agreement. 
Subsidiary Guaranty Agreement, dated December 8, 
2016. 
Subsidiary Guaranty Agreement, dated as of 
February 15, 2017. 
Restated Littelfuse, Inc. Supplemental Retirement 
and Savings Plan, effective January 1, 2017. ++ 

Incorporated by Reference Herein 

Form 
10-Q 

Exhibit  Filing Date 
05/06/2016 

10.6 

File No. 
0-20388 

10-Q 

10.7 

05/06/2016 

0-20388 

8-K 

10.1 

07/26/2016 

0-20388 

8-K 

10.1 

11/16/2016 

0-20388 

8-K 

10.2 

11/16/2016 

0-20388 

8-K 

10.3 

11/16/2016 

0-20388 

8-K 

10.1 

12/09/2016 

0-20388 

8-K 

10.2 

12/09/2016 

0-20388 

8-K 

8-K 

10.4 

12/09/2016 

0-20388 

10.2 

2/15/2017 

0-20388 

10-K 

10.50 

02/27/2017 

0-20388 

10.51 

   Amended and Restated Littelfuse, Inc. 401(k) 

10-K 

10.51 

02/27/2017 

0-20388 

Retirement and Savings Plan, effective January 1, 
2017.++ 

10.52 

   Amended and Restated Littelfuse, Inc. Long-Term 

8-K 

10.1 

05/01/2017 

0-20388 

10.53 

10.54 
10.55 

10.56 

Incentive Plan. ++ 
Form of 2017 Restricted Stock Unit Award 
Agreement. ++ 
Form of 2017 Stock Option Award Agreement. ++ 

   Amended and Restated Employment Agreement, 
effective as of April 18, 2017, between Littelfuse, 
Inc. and Dieter Roeder. ++ 
Employment offer letter between Littelfuse, Inc. and 
Jeffrey Gorski, dated June 28, 2017. ++ 

8-K 

10.2 

05/01/2017 

0-20388 

8-K 
10-Q 

10.3 
10.1 

05/01/2017 
08/02/2017 

0-20388 
0-20388 

8-K 

10.1 

08/14/2017 

0-20388 

83 

 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
Exhibit No.    
10.57 

10.58 

Description 
Form of Change of Control Agreement (J. Gorski). 
++ 
First Amendment to Credit Agreement, dated as of 
November 1, 2016, among Littelfuse, Inc., certain 
subsidiaries of the company, as designated 
borrowers, certain subsidiaries of the company, as 
guarantors, the lenders party thereto and Bank of 
America, N.A., as agent. 
Second Amendment to Credit Agreement, dated as 
of October 13. 2017, among Littelfuse, Inc., certain 
subsidiaries of the company, as designated 
borrowers, certain subsidiaries of the company, as 
guarantors, the lenders party thereto and Bank of 
America, N.A., as agent. 
Joinder Agreement, dated as of October 13, 2017, by 
and between Iron Merger Co., Inc. and Bank of 
America, N.A., as agent. 
Joinder Agreement, dated as of October 13, 2017, by 
and between IXYS Merger Co., LLC and Bank of 
America, N.A., as agent. 

   U.S. Subsidiary Guarantor Supplement, dated as of 
October 13, 2017, made by Iron Merger Co., Inc. in 
favor of the note purchasers and the other holders. 
   U.S. Subsidiary Guarantor Supplement, dated as of 
October 13, 2017, made by IXYS Merger Co., LLC 
in favor of the note purchasers and the other holders. 
Cross Border Subsidiary Guarantor Supplement, 
dated as of October 13, 2017, made by Iron Merger 
Co., Inc. in favor of the note purchasers and the other 
holders. 
Cross Border Subsidiary Guarantor Supplement, 
dated as of October 13, 2017, made by IXYS Merger 
Co., LLC in favor of the note purchasers and the 
other holders. 

   Note Purchase Agreement, dated November 15, 
2017, among Littelfuse, Inc. and note purchasers 
listed on the signature pages thereto. 
Form of 3.78% Senior Note, Series B, due February 
15, 2030. 
Form of 3.48% Senior Note, Series A, due February 
15, 2025, 
Subsidiary Guaranty Agreement, dated as of January 
16, 2018, made by LFUS LLC, Littelfuse 
Commercial Vehicle, LLC, Iron Merger Co., Inc., 
IXYS Merger Co., LLC and SymCom, Inc. in favor 
of the note purchasers and the other holders. 
Seventh Amended and Restated Employment 
Agreement, dated as of August 25, 2017, by and 
between IXYS Corporation and Nathan Zommer. ++ 
Littelfuse, Inc. Executive Severance Policy. ++ 

84 

10.59 

10.60 

10.61 

10.62 

10.63 

10.64 

10.65 

10.66 

10.67 

10.68 

10.69 

10.70 

10.71 

Incorporated by Reference Herein 

Form 
8-K 

Exhibit  Filing Date 
08/14/2017 

10.2 

File No. 
0-20388 

8-K 

10.1 

10/16/2017 

0-20388 

8-K 

10.2 

10/16/2017 

0-20388 

8-K 

10.3 

10/16/2017 

0-20388 

8-K 

10.4 

10/16/2017 

0-20388 

8-K 

10.5 

10/16/2017 

0-20388 

8-K 

10.6 

10/16/2017 

0-20388 

8-K 

10.7 

10/16/2017 

0-20388 

8-K 

10.8 

10/16/2017 

0-20388 

8-K 

10.1 

11/15/2017 

0-20388 

8-K 

8-K 

8-K 

4.2 

4.1 

11/15/2017 

0-20388 

11/15/2017 

0-20388 

10.2 

01/18/2018 

0-20388 

8-K 

10.3 

01/18/2018 

0-20388 

8-K 

10.4 

01/18/2018 

0-20388 

 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
Exhibit No.    
10.72 
10.73* 

10.74* 

10.75* 

Description 
Form of Tier I Change of Control Agreement.++ 
First Amendment to Littelfuse Deferred 
Compensation Plan for Non-Employee Directors, 
effective as of January 1, 2008.++ 
Second Amendment to the Littelfuse Deferred 
Compensation Plan for Non-Employee Directors, 
effective as of October 25, 2013.++ 
First Amendment to the Littelfuse, Inc. 401(K) 
Retirement and Savings Plan, effective January 1, 
2018.++ 

10.76* 

   Altra In-Plan Roth Rollover Amendment to the 

10.77* 

10.78 

10.79 

10.80 
10.81 
10.82 
10.83 
10.84 
10.85 
10.86 

10.87 

10.88 

10.89 

10.90 

Littelfuse, Inc. 401(K) Retirement and Savings Plan, 
effective as of February 1, 2018.++ 
Summary of Non-Employee Director 
Compensation.++ 
Form of Indemnity Agreement by and between 
Nathan Zommer and IXYS Corporation,++ 
IXYS Corporation 1999 Equity Incentive Plan, as 
amended.++ 
IXYS Corporation 2009 Equity Incentive Plan++ 
IXYS Corporation 2011 Equity Incentive Plan++ 
IXYS Corporation 2013 Equity Incentive Plan++ 
IXYS Corporation 2016 Equity Incentive Plan++ 
Zilog, Inc. 2002 Omnibus Stock Incentive Plan++ 
Zilog, Inc. 2004 Omnibus Stock Incentive Plan++ 
Form of Stock Option Agreement for the IXYS 
Corporation 1999 Equity Incentive Plan++ 
Form of Stock Option Agreement for the IXYS 
Corporation 1999 Equity Incentive Plan with net 
exercise provision.++ 
Form of Stock Option Agreement for the IXYS 
Corporation 1999 Equity Incentive Plan for non-
employee directors++ 

   Notice of Stock Option Grant and Agreement for the 
IXYS Corporation 2009 Equity Incentive Plan++ 
Form of Nonqualified Stock Option Agreement for 
Stock Options pursuant to the Zilog, Inc. 2002 
Omnibus Stock Incentive Plan++ 

Incorporated by Reference Herein 

Form 
8-K 

Exhibit  Filing Date 
01/23/2018 

10.1 

File No. 
0-20388 

10-K 

10.3 

06/12/2008 

000-26124 

S-8 

4.3 

01/19/2018 

333-221147 

S-8 
S-8 
S-8 
S-8 
S-8 
S-8 
10-Q 

4.4 
4.5 
4.6 
4.7 
4.8 
4.9 
10.3 

01/19/2018 
01/19/2018 
01/19/2018 
01/19/2018 
01/19/2018 
01/19/2018 
11/09/2004 

333-221147 
333-221147 
333-221147 
333-221147 
333-221147 
333-221147 
000-26124 

10-K 

10.23 

06/22/2006 

000-26124 

10-K 

10.24 

06/22/2006 

000-26124 

10-Q 

10.4 

08/10/2009 

000-26124 

10-K 

10.26 

06/11/2010 

000-26124 

85 

 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
Incorporated by Reference Herein 

Form 
10-K 

Exhibit  Filing Date 
06/11/2010 

10.28 

File No. 
000-26124 

10-Q 

10.2 

08/05/2011 

000-26124 

10-Q 

10.6 

08/09/2013 

000-26124 

10-Q 

10.1 

11/03/2016 

000-26124 

Exhibit No.    
10.91 

Description 
Form of Nonqualified Stock Option Agreement for 
Stock Options pursuant to the Zilog, Inc. 2004 
Omnibus Stock Incentive Plan++ 

10.92 

10.93 

10.94 

21.1* 
23.1* 

31.1* 

31.2* 

32.1+++ 

   Notice of Stock Option Grant and Agreement for 
IXYS Corporation 2011 Equity Incentive Plan++ 
   Notice of Stock Option Grant and Agreement for 
IXYS Corporation 2013 Equity Incentive Plan++ 
   Notice of Stock Option Grant and Agreement for 
IXYS Corporation 2016 Equity Incentive Plan++ 
Subsidiaries. 
Consent of Independent Registered Public 
Accounting Firm. 
Certification of Chief Executive Officer Pursuant to 
Section 302 of the Sarbanes-Oxley Act of 2002. 
Certification of Chief Financial Officer Pursuant to 
Section 302 of the Sarbanes-Oxley Act of 2002. 
Certification of the Chief Executive Officer and 
Chief Financial Officer Pursuant to Section 906 of 
the Sarbanes-Oxley Act of 2002. 

   XBRL Instance Document. 

101.INS* 
101.SCH*     XBRL Taxonomy Extension Schema Document. 
101.CAL*     XBRL Taxonomy Extension Calculation Linkbase 

Document. 

101.LAB*     XBRL Taxonomy Extension Label Linkbase 

Document. 

101.PRE*     XBRL Taxonomy Extension Presentation Linkbase 

Document. 

101.DEF*     XBRL Taxonomy Extension Definition Linkbase 

Document. 

* Filed with this Report. 

+ Exhibits and schedules omitted pursuant to Item 601(b)(2) of Regulation S-K. Littelfuse agrees to furnish a supplemental 
copy of an omitted exhibit or schedule to the SEC upon request. 

++ Management contract or compensatory plan or arrangement. 

+++ Furnished with this Report. 

86 

 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
 
SECTION 302 CERTIFICATION 

I, David W. Heinzmann, certify that:  

1. 

I have reviewed this Annual Report on Form 10-K of Littelfuse Inc.;  

EXHIBIT 31.1 

2.  Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material
fact necessary to make the statements made, in light of the circumstances under which such statements were made,
not misleading with respect to the period covered by this report; 

3.  Based  on  my  knowledge,  the  financial  statements,  and  other  financial  information  included  in  this  report,  fairly 
present in all material respects the financial condition, results of operations and cash flows of the registrant as of,
and for, the periods presented in this report; 

4.  The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls
and  procedures  (as  defined  in  Exchange  Act  Rules  13a-15(e)  and  15d-15(e))  and  internal  control  over  financial
reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f))for the registrant and have:  

(a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to 
be designed under our supervision, to ensure that material information relating to the registrant, including 
its consolidated subsidiaries, is made known to us by others within those entities, particularly during the 
period in which this report is being prepared;  

(b) designed such internal control over financial reporting, or caused such internal control over financial 
reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of 
financial  reporting  and  the preparation  of financial statements for external  purposes  in accordance with 
generally accepted accounting principles; 

(c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this 
report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of 
the period covered by this report based on such evaluation; and  

(d)  disclosed  in  this  report  any  change  in  the  registrant’s  internal  control  over  financial  reporting  that 
occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case 
of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s 
internal control over financial reporting; and 

5.  The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control 
over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or
persons performing the equivalent functions):  

(a) all significant deficiencies and material weaknesses in the design or operation of internal control over 
financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, 
summarize and report financial information; and  

(b) any fraud, whether or not material, that involves management or other employees who have a significant 
role in the registrant’s internal control over financial reporting.  

Dated: February 23, 2018 

/s/ DAVID W HEINZMANN 

   David W. Heinzmann 
   President and Chief Executive Officer 

 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
SECTION 302 CERTIFICATION 

I, Meenal A. Sethna, certify that:  

1. 

I have reviewed this Annual Report on Form 10-K of Littelfuse Inc.;  

EXHIBIT 31.2 

2.  Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material
fact necessary to make the statements made, in light of the circumstances under which such statements were made,
not misleading with respect to the period covered by this report; 

3.  Based  on  my  knowledge,  the  financial  statements,  and  other  financial  information  included  in  this  report,  fairly
present in all material respects the financial condition, results of operations and cash flows of the registrant as of,
and for, the periods presented in this report; 

4.  The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls
and  procedures  (as  defined  in  Exchange  Act  Rules  13a-15(e)  and  15d-15(e))  and  internal  control  over  financial
reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f))for the registrant and have:  

(a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to 
be designed under our supervision, to ensure that material information relating to the registrant, including 
its consolidated subsidiaries, is made known to us by others within those entities, particularly during the 
period in which this report is being prepared;  

(b) designed such internal control over financial reporting, or caused such internal control over financial 
reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of 
financial reporting and the preparation of financial statements for external purposes in accordance with 
generally accepted accounting principles; 

(c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this 
report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of 
the period covered by this report based on such evaluation; and  

(d)  disclosed  in  this  report  any  change  in  the  registrant’s  internal  control  over  financial  reporting  that 
occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case 
of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s 
internal control over financial reporting; and 

5.  The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control
over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or
persons performing the equivalent functions):  

(a) all significant deficiencies and material weaknesses in the design or operation of internal control over 
financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, 
summarize and report financial information; and  

(b) any fraud, whether or not material, that involves management or other employees who have a significant 
role in the registrant’s internal control over financial reporting.  

Dated: February 23, 2018 

/s/ MEENAL A. SETHNA 

   Meenal A. Sethna 
   Executive Vice President and 
   Chief Financial Officer 

 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
LITTELFUSE, INC. 

EXHIBIT 32.1 

Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350 

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, Chapter 63 of title 18, 
United States Code), each of the undersigned officers of Littelfuse, Inc. (“the Company”) does hereby certify that to his 
knowledge: 

The Annual Report of the Company on Form 10-K for the fiscal year ended December 30, 2017 (“the Report”) fully complies 
with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, and the information contained in the 
Report fairly presents, in all material respects, the financial condition and results of operations of the Company. 

/s/ DAVID W. HEINZMANN 
David W. Heinzmann 
President and Chief Executive 
Officer 

/s/ MEENAL A. SETHNA 
Meenal A. Sethna 
Executive Vice President and 
Chief Financial Officer 

Dated: February 23, 2018 

Dated: February 23, 2018 

 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
M I C H A E L   P.   R U T Z
Senior Vice President, 
Global Operations

M AT T H E W   J .   C O L E
Senior Vice President and General 
Manager, Industrial Business Unit 

I A N   H I G H L E Y
Senior Vice President and General 
Manager, Semiconductor Products 
and Chief Technology Offi cer

D E E PA K   N AYA R
Senior Vice President and General 
Manager, Electronics Business Unit

EXECUTIVE OFFICERS

DAV I D  W.   H E I N Z M A N N
President and Chief 
Executive Offi cer

M E E N A L   A .   S E T H N A
Executive Vice President 
and Chief Financial Offi cer

R YA N   K .   S TA F F O R D
Executive Vice President, Chief Legal 
and Human Resources Offi cer and 
Corporate Secretary

BOARD OF DIRECTORS

T Z A U - J I N   C H U N G
Operating Partner
Core Industrial Partners LLC

J O H N   E .   M A J O R
President
MTSG

C A R Y  T.   F U
Co-Founder and 
Retired Chairman
Benchmark Electronics, Inc.

A N T H O N Y   G R I L L O
Founder 
Ascribe Opportunities 
Management, LLC

DAV I D  W.   H E I N Z M A N N
President and 
Chief Executive Offi cer
Littelfuse, Inc.

G O R D O N   H U N T E R
Chairman of the Board
Retired President and 
Chief Executive Offi cer
Littelfuse, Inc.

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W I L L I A M   P.   N O G L OW S
Chairman of the Board
Cabot Microelectronics 
Corporation

R O N A L D   L .   S C H U B E L
Retired Executive Vice President 
and President of the Americas Region 
Molex Incorporated

D R .   N AT H A N   Z O M M E R
Founder, former Chairman 
and Chief Executive Offi cer 
IXYS Corporation

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS 
UNDER THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995 (“PSLRA”)

The statements contained in the letter to shareholders and the other sections of this report and in the Company’s Annual Report on Form 
10-K that are not historical facts are intended to constitute “forward-looking statements” entitled to the safe-harbor provisions of the PSLRA. 
These statements may involve risks and uncertainties, including, but not limited to, risks relating to product demand and market acceptance, 
economic conditions, the impact of competitive products and pricing, product quality problems or product recalls, capacity and supply 
diffi culties or constraints, coal mining exposures reserves, failure of an indemnifi cation for environmental liability, exchange rate fl uctuations, 
commodity price fl uctuations, the effect of the company’s accounting policies, labor disputes, restructuring costs in excess of expectations, 
pension plan asset returns less than assumed, integration of acquisitions, uncertainties related to political and regulatory changes and other 
risks that may be detailed in “Item 1A, Risk Factors” in the Form 10-K and in the Company’s other Securities and Exchange Commission fi lings.

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CORPORATE INFORMATION

A N N U A L  M E E T I N G
A N N U A L   M E E T I N G

The Annual Meeting of Littelfuse, Inc. will be held at 
9:00 a.m. Central Time on April 27, 2018, at the O’Hare 
Plaza First Floor Conference Center, 8745 West Higgins 
Road, Chicago, IL 60631. Proxy materials and a copy 
of this report will be mailed or made available via the 
Internet in advance of the meeting to all shareholders 
of record as of March 1, 2018.

C O M M O N   S T O C K
C O M M O N  S T O C K

Littelfuse, Inc. common stock is traded on the NASDAQ® 
Global Select Market under the symbol LFUS. 

S H A R E H O L D E R   I N F O R M AT I O N
S H A R E H O L D E R  I N F O R M AT I O N

In addition to annual reports to shareholders, copies of 
the Company’s fi lings with the Securities and Exchange 
Commission are available on the Investor Relations 
section of our website at: investor.littelfuse.com.

I N D E P E N D E N T   R E G I S T E R E D 
I N D E P E N D E N T  R E G I S T E R E D  
P U B L I C   A C C O U N T I N G   F I R M
P U B L I C  A C C O U N T I N G  F I R M

Grant Thornton LLP
171 N. Clark Street
Suite 200 
Chicago, IL 60601

T R A N S F E R   A G E N T
T R A N S F E R  A G E N T

EQ Shareowner Services
110 Centre Pointe Curve, Suite 101
Mendota Heights, MN 55110
1.800.468.9716

L I T T E L F U S E  W O R L D   H E A D Q U A R T E R S
L I T T E L F U S E W O R L D  H E A D Q U A R T E R S

Littelfuse, Inc.
8755 West Higgins Road
Suite 500  
Chicago, IL 60631
+1.773.628.1000

Littelfuse.com

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2017
ANNUAL 
REPORT

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© 2018 Littelfuse, Inc. | Form: CM105-EN